Professor Sam Oliver

Athro mewn Gwyddorau Chwaraeon ac Ymarfer Corff

Contact info

Position: Professor

Email: s.j.oliver@bangor.ac.uk

Phone: (01248) 38 3965

Location: Room 301, George Building, Normal Site

To book a student tutorial please visit: https://outlook.office365.com/owa/calendar/SHESStaffTutorialandDropInHours@bangoroffice365.onmicrosoft.com/bookings/

  1. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  2. Cyhoeddwyd

    A comparison of heat acclimation by post-exercise hot water immersion and exercise in the heat

    McIntyre, R., Mee, J., Zurawlew, M., Oliver, S., Cox, A. & Walsh, N., 1 Awst 2021, Yn: Journal of Science and Medicine in Sport. 24, 8, t. 729-734

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    A comparison of medium-term heat acclimation by post-exercise hot water immersion or exercise in the heat: Adaptations, overreaching, and thyroid hormones

    McIntyre, R., Zurawlew, M., Mee, J., Walsh, N. & Oliver, S., 1 Tach 2022, Yn: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 323, 5, t. R601-R615

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index

    Maughan, R. J., Watson, P., Cordery, P. A. A., Walsh, N. P., Oliver, S. J., Dolci, A., Rodriguez-Sanchez, N. & Galloway, S. D. R., Maw 2016, Yn: American Journal of Clinical Nutrition. 103, 3, t. 717-723

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Anxiety and motor performance: More evidence for the effectiveness of holistic process goals as a solution to the process goal paradox

    Mullen, R., Jones, E., Oliver, S. & Hardy, L., 1 Tach 2016, Yn: Psychology of Sport and Exercise. 27, November 2016, t. 142 149 t., 27.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Baroreflex Control of Sympathetic Vasomotor Activity and Resting Arterial Pressure at High Altitude: Insight from Lowlanders and Sherpa

    Simpson, L., Busch, S., Oliver, S., Ainslie, P., Stembridge, M., Steinback, C. & Moore, J., 1 Mai 2019, Yn: Journal of Physiology. 597, 9, t. 2379-2390 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Beetroot Juice Does Not Enhance Altitude Running Performance in Well-Trained Athletes

    Arnold, J. T., Oliver, S. J., Lewis-Jones, T. M., Wylie, L. J. & Macdonald, J. H., 4 Chwef 2015, Yn: Applied Physiology, Nutrition, and Metabolism.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Bilateral regional extracranial blood flow regulation to hypoxia and unilateral duplex ultrasound measurement error

    Friend, A., Rogan, M., Rossetti, G., Lawley, J., Mullins, P., Sandoo, A., Macdonald, J. & Oliver, S., 1 Gorff 2021, Yn: Experimental Physiology. 106, 7, t. 1535-1548 14 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Body composition at high altitude: a randomized placebo-controlled trial of dietary carbohydrate supplementation.

    Macdonald, J. H., Oliver, S. J., Hillyer, K., Sanders, S., Smith, Z., Williams, C., Yates, D., Ginnever, H., Scanlon, E., Roberts, E., Murphy, D., Lawley, J. & Chichester, E., 1 Tach 2009, Yn: American Journal of Clinical Nutrition. 90, 5, t. 1193-1202

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Carbohydrate Supplementation and Exercise Performance at High Altitude: A Randomized Controlled Trial

    Oliver, S. J., Golja, P. & Macdonald, J. H., 19 Maw 2012, Yn: High Altitude Medicine and Biology. 13, 1, t. 22-31

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Control of blood pressure in the cold: Differentiation of skin and skeletal muscle vascular resistance

    Mugele, H., Marume, K., Amin, S., Possnig, C., Kuhn, L., Riehl, L., Pieper, R., Schabbehard, E.-L., Oliver, S., Gagnon, D. & Lawley, J., 1 Ion 2023, Yn: Experimental Physiology. 108, 1, t. 38-49 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Development of a hydration index: a randomized trial to assess the potential of different beverages to affect hydration status

    Oliver, S. J., Walsh, N. P., Maughan, R. J., Watson, P., Cordery, P. A., Dolci, A., Rodriguez-Sanchez, N. & Galloway, S. D., Rhag 2015, Yn: Nutricion Hospitalaria. 32, 2, t. 7

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    Dietary nitrate supplementation effect on dynamic cerebral autoregulation in normoxia and acute hypoxia

    Horiuchi, M., Rossetti, G. & Oliver, S., Maw 2022, Yn: Journal of Cerebral Blood Flow and Metabolism. 42, 3, t. 486-494

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    Dietary nitrate supplementation increases acute mountain sickness severity and sense of effort during hypoxic exercise

    Rossetti, G., Macdonald, J., Wylie, L. J., Little, S., Newton, V., Wood, B., Hawkins, K., Beddoe, R., Davies, H. E. & Oliver, S., Hyd 2017, Yn: Journal of Applied Physiology. 123, 4, t. 983-992

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Endurance running performance after 48 hours of restricted fluid and/or energy intake

    Oliver, S. J., Laing, S., Wilson, S., Bilzon, J. L. & Walsh, N. P., 1 Chwef 2007, Yn: Medicine and Science in Sports and Exercise. 39, 2, t. 316-322

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Evidence for a physiological role of pulmonary arterial baroreceptors in sympathetic neural activation in healthy humans

    Simpson, L., Meah, V., Steele, A., Thapamagar, S., Gasho, C., Anholm, J., Drane, A., Dawkins, T., Busch, S., Oliver, S., Lawley, J., Tymko, M., Ainslie, P., Steinback, C., Stembridge, M. & Moore, J., Maw 2020, Yn: Journal of Physiology. 598, 5, t. 955-965

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Exercise, immune function and respiratory infection: An update on the influence of training and environmental stress

    Walsh, N. P. & Oliver, S. J., 8 Rhag 2015, Yn: Immunology and Cell Biology. 94, 2, t. 132-139

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Five days of tart cherry supplementation improves exercise performance in normobaric hypoxia

    Horiuchi, M., Fukuoka, Y., Koyama, K. & Oliver, S., 12 Ion 2023, Yn: Nutrients. 15, 2, 388.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Global REACH 2018: Andean highlanders, chronic mountain sickness and the integrative regulation of resting blood pressure

    Simpson, L., Meah, V., Steele, A., Gasho, C., Howe, C., Dawkins, T., Busch, S., Oliver, S., Moralez, G., Lawley, J., Tymko, M., Vizcardo-Galindo, G. A., Figueroa-Mujíca , R. J., Villafuerte, F., Ainslie, P., Stembridge, M., Steinback, C. & Moore, J., 1 Ion 2021, Yn: Experimental Physiology. 106, 1, t. 104-116

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Good perceived sleep quality protects against the raised risk of respiratory infection during sleep restriction in young adults

    Walsh, N., Kashi, D. S., Edwards, J., Richmond, C., Oliver, S., Roberts, R., Izard, R., Jackson, S. & Greeves, J., Ion 2023, Yn: SLEEP. 46, 1, zsac222.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Greater post-exercise hypotension in healthy young untrained men after exercising in a hot compared to a temperate environment

    Horiuchi, M. & Oliver, S., Hyd 2023, Yn: Journal of Thermal Biology. 117, 103683.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    High altitude impairs in vivo immunity in humans

    Smith, A. D., Oliver, S. J., Macdonald, J. H., Harper Smith, A. D., Lawley, J. S., Gallagher, C. A., Di Felice, U. & Walsh, N. P., 24 Meh 2013, Yn: High Altitude Medicine and Biology. 14, 2, t. 144-149

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Wedi ei Dderbyn / Yn y wasg

    Hormonal contraceptive use and physical performance, body composition, and musculoskeletal injuries during military training

    O'Leary, T. J., Evans, H., Close, M.-E., Izard, R. M., Walsh, N., Coombs, C., Carswell, A., Oliver, S., Tang, J. C. Y., Fraser, W. & Greeves, J. P., 11 Hyd 2024, (Wedi ei Dderbyn / Yn y wasg) Yn: Medicine and Science in Sports and Exercise.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    Hydration marker diagnostic accuracy to identify mild intracellular and extracellular dehydration

    Owen, J. A., Fortes, M. B., Ur Rahman, S., Jibani, M., Walsh, N. P. & Oliver, S. J., Tach 2019, Yn: International Journal of Sport Nutrition and Exercise Metabolism. 29, 6, t. 604-611 23 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    Hypoxia alters posterior cingulate cortex metabolism during a memory task: a 1H fMRS study

    Rogan, M., Friend, A., Rossetti, G. M. K., Edden, R. A. E., Mikkelsen, M., Oliver, S., Macdonald, J. & Mullins, P., 15 Hyd 2022, Yn: Neuroimage. 260, 119397.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Hypoxia-induced endothelial dysfunction: Could targeting oxidative stress provide protection?

    Rossetti, G., Oliver, S., Sandoo, A. & Macdonald, J., 26 Mai 2023, Yn: Experimental Physiology. 108, 8, t. 1026-1028 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Increased Risk of Upper Respiratory Infection in Military Recruits Who Report Sleeping Less Than 6 h per night

    Wentz, L. M., Ward, M. D., Potter, C., Oliver, S. J., Jackson, S., Izard, R. M., Greeves, J. P. & Walsh, N. P., Tach 2018, Yn: Military Medicine. 183, 11-12, t. e699–e704 22 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training

    Harrison, S., Oliver, S., Kashi, D., Carswell, A., Edwards, J., Wentz, L., Roberts, R., Tang, J., Izard, R., Jackson, S., Allan, D., Rhodes, L., Fraser, W., Greeves, J. & Walsh, N., 1 Gorff 2021, Yn: Medicine and Science in Sports and Exercise. 53, 7, t. 1505-1516 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Influence of fluid intake on soccer performance in a temperate environment

    Owen, J. A., Kehoe, S. J. & Oliver, S. J., 5 Medi 2012, Yn: Journal of Sports Sciences. 31, 1

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Influence of timing of postexercise carbohydrate-protein ingestion on selected immune indices

    Costa, R. J. S., Oliver, S. J., Laing, S. J., Waiters, R., Bilzon, J. L. J. & Walsh, N. P., Awst 2009, Yn: International Journal of Sport Nutrition and Exercise Metabolism. 19, 4, t. 366-384 19 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Influence of vitamin D supplementation by sunlight or oral D3 on exercise performance

    Carswell, A. T., Oliver, S. J., Wentz, L. M., Kashi, D. S., Roberts, R., Tang, J. C., Izard, R. M., Jackson, S., Allan, D., Rhodes, L. E., Fraser, W. D., Greeves, J. P. & Walsh, N. P., Rhag 2018, Yn: Medicine and Science in Sports and Exercise. 50, 12, t. 2555-2564

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Integrative crosstalk between hypoxia and the cold: old data and new opportunities

    Mugele, H., Oliver, S., Gagnon, D. & Lawley, J., 1 Ion 2021, Yn: Experimental Physiology. 106, 1, t. 350-358

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Investigation of whole-brain white matter identifies altered water mobility in the pathogenesis of high-altitude headache

    Lawley, J., Oliver, S. J., Mullins, P. G. & Macdonald, J. H., 1 Awst 2013, Yn: Journal of Cerebral Blood Flow and Metabolism. 33, 8, t. 1286-1294

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. E-gyhoeddi cyn argraffu

    Iron status is associated with tibial structure and vitamin D metabolites in healthy young men

    O'Leary, T. J., Jackson, S., Izard, R. M., Walsh, N. P., Carswell, A. T., Oliver, S., Tang, J., Fraser, W. & Greeves, J. P., 3 Meh 2024, (E-gyhoeddi cyn argraffu) Yn: Bone. 186

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Is This Elderly Patient Dehydrated? Diagnostic Accuracy of Hydration Assessment Using Physical Signs, Urine, and Saliva Markers

    Fortes, M. B., Owen, J. A., Raymond-Barker, P., Bishop, C., Elghenzai, S., Oliver, S. J. & Walsh, N. P., 22 Hyd 2014, Yn: Journal of the American Medical Directors Association. 16, 3, t. 221-228

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Lets go Surfing now, everybody's learning how; attentional strategies on expert and novice surfing performance under both practice and competition conditions

    Lawrence, G. P., Virian, J., Oliver, S. J. & Gottwald, V. M., 2020, Yn: European Journal of Sport Science. 20, 2, t. 229-239 11 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    MEDEX2015: Greater sea-level fitness is associated with lower sense of effort during Himalayan trekking without worse Acute Mountain Sickness

    Rossetti, G., Macdonald, J., Smith, M., Jackson, A., Callender, N., Newcombe, H. K., Storey, H., Willis, S., van den Beukel, J., Woodward, J., Pollard, J., Wood, B., Newton, V., Virian, J., Haswell, O. & Oliver, S., 1 Meh 2017, Yn: High Altitude Medicine and Biology. 18, 2, t. 152-162

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Neutrophil-degranulation and lymphocyte-subset response after 48 hr of fluid and/or energy restriction

    Laing, S. J., Oliver, S. J., Wilson, S., Walters, R., Bilzon, J. L. J. & Walsh, N. P., Hyd 2008, Yn: International Journal of Sport Nutrition and Exercise Metabolism. 18, 5, t. 443-56 14 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    No effect of a 30 h period of sleep deprivation on leukocyte trafficking, neutrophil degranulation and saliva IgA responses to exercise.

    Laing, S., Costa, R. J., Cartner, L., Oliver, S. J., Laing, S. J., Walters, R., Bilzon, J. L. & Walsh, N. P., 1 Chwef 2009, Yn: European Journal of Applied Physiology. 105, 3, t. 499-504

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Normobaric hypoxia and symptoms of acute mountain sickness: Elevated brain volume and intracranial hypertension

    Lawley, J. S., Alperin, N., Bagci, A. M., Lee, S. H., Mullins, P. G., Oliver, S. J. & Macdonald, J. H., 20 Mai 2014, Yn: Annals of Neurology. 75, 6, t. 890-898

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    One night of sleep deprivation decreases treadmill endurance performance.

    Laing, S., Oliver, S. J., Costa, R. J., Laing, S. J., Bilzon, J. L. & Walsh, N. P., 1 Medi 2009, Yn: European Journal of Applied Physiology. 107, 2, t. 155-161

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Optic Nerve Sheath Diameter Is Not Related to High Altitude Headache: A Randomized Controlled Trial

    Lawley, J. S., Oliver, S. J., Mullins, P. G., Morris, D., Junglee, N. A., Jelleyman, C. & Macdonald, J. H., 1 Medi 2012, Yn: High Altitude Medicine and Biology. 13, 3, t. 193-199

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Physiological and Psychological Illness Symptoms at High Altitude and Their Relationship With Acute Mountain Sickness: A Prospective Cohort Study

    Hardy, L. J., Arthur, C. A., Roberts, R. J., Oliver, S. J., Sanders, S. J., Williams, C. J., Smith, Z. A., Lloyd-Davies E.*, [. V., Roberts, R., Arthur, C., Hardy, L. & Macdonald, J. H., 1 Gorff 2012, Yn: Journal of Travel Medicine. 19, 4, t. 210-219

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Portable prehospital methods to treat near-hypothermic shivering cold casualties

    Raymond-Barker, P., Dolci, A., Oliver, S. J., Brierley, J. L., Raymond-Barker, P. C., Doci, A. & Walsh, N. P., 1 Maw 2016, Yn: Wilderness and Environmental Medicine. 27, 1, t. 125-130

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Position statement. Part two: Maintaining immune health

    Walsh, N. P., Gleeson, M., Pyne, D. B., Nieman, D. C., Dhabhar, F. S., Shephard, R. J., Oliver, S. J., Bermon, S. & Kajeniene, A., 2011, Yn: Exercise Immunology Review. 17, t. 64-103 40 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. E-gyhoeddi cyn argraffu

    Post-exercise hypotension after exercising in hypoxia with and without tart cherry supplementation

    Horiuchi, M. & Oliver, S., 15 Tach 2024, (E-gyhoeddi cyn argraffu) Yn: High Altitude Medicine and Biology.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Prolonged (9 h) poikilocapnic hypoxia (12% O2) augments cutaneous thermal hyperaemia in healthy humans

    Lawley, J. S., Oliver, S. J., Mullins, P. G., Macdonald, J. H. & Moore, J. P., 1 Meh 2014, Yn: Experimental Physiology. 99, t. 909-920

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Re: Luteinizing hormone-releasing hormone agonist effects on skeletal muscle: How hormonal therapy in prostate cancer affects muscular strength

    Marcora, S., Oliver, S. J., Callow, N., Lemmey, A. & Stuart, N., 1 Tach 2005, Yn: Journal of Urology. 174, 5, t. 2068-2069

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Response to the Letter to the Editor by Aaron Spital, “Is This Elderly Patient Dehydrated? Diagnostic Accuracy of Hydration Assessment Using Physical Signs, Urine, and Saliva Markers”

    Fortes, M., Owen, J., Oliver, S. & Walsh, N. P., 1 Awst 2015, Yn: Journal of the American Medical Directors Association. 16, 8, t. 708

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Reversal of neurovascular coupling in the default mode network: Evidence from hypoxia

    Rossetti, G., d'Avossa, G., Rogan, M., Macdonald, J., Oliver, S. & Mullins, P., Ebr 2021, Yn: Journal of Cerebral Blood Flow and Metabolism. 41, 4, t. 805–818 14 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  51. Cyhoeddwyd

    Saliva indices track hypohydration during 48 h of fluid restriction or combined fluid and energy restriction.

    Oliver, S. J., Laing, S., Wilson, S., Bilzon, J. L. & Walsh, N., 1 Hyd 2008, Yn: Archives of Oral Biology. 53, 10, t. 975-980

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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