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i
  1. Cyhoeddwyd

    Schizosaccharomyces pombe Mms1 channels repair of perturbed replication into Rhp51 independent homologous recombination

    Vejrup-Hansen, R., Mizuno, K., Miyabe, I., Fleck, O., Holmberg, C., Murray, J. M., Carr, A. M. & Nielsen, O., 7 Maw 2011, Yn: DNA Repair. 10, 3, t. 283–295

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  2. Cyhoeddwyd

    Spd2 assists Spd1 in the modulation of ribonucleotide reductase architecture but does not regulate deoxynucleotide pools

    Vejrup-Hansen, R., Fleck, O., Landvad, K., Fahnoe, U., Broendum, S. S., Schreurs, A. S., Kragelund, B. B., Carr, A. M., Holmberg, C. & Nielsen, O., 1 Meh 2014, Yn: Journal of Cell Science. 127, 11, t. 2460-2470

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica

    Velasco-Castrillon, A., McInnes, S. J., Schultz, M. B., Arroniz-Crespo, M., D'Haese, C. A., Gibson, J. A., Adams, B. J., Page, T. J., Austin, A. D., Cooper, S. J. & Stevens, M. I., 22 Rhag 2015, Yn: Invertebrate Systematics. 29, 6, t. 578-590

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Comparison of the effects of exercise and anti-TNF treatment on cardiovascular health in rheumatoid arthritis: results from two controlled trials

    Veldhuijzen van Zanten, J. J. C. S., Sandoo, A., Metsios, G. S., Stavropoulos-Kalinoglou, A., Ntoumanis, N. & Kitas, G. D., Chwef 2019, Yn: Rheumatology international. 39, 2, t. 219-225

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Management of neuronopathic Gaucher disease: Revised recommendations

    Vellodi, A., Tylki-Szymanska, A., Davies, E. H., Kolodny, E., Bembi, B., Collin-Histed, T., Mengel, E., Erikson, A. & Schiffman, R., 1 Hyd 2009, Yn: Journal of Inherited Metabolic Disease. 32, 5, t. 660-664

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Some associations between reading and spelling development in Slovak speaking children.

    Vencelova, L., Caravolas, M. & Mikulajova, M., 1 Ion 2009, Yn: Logopaedica. 12, t. 60-69

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Tracing a toad invasion: lack of mitochondrial DNA variation, haplotype origins, and potential distribution of introduced Duttaphrynus melanostictus in Madagascar

    Vences, M., Brown, J. L., Lathrop, A., Gonçalo, R. M., Cameron, A., Crottini, A., Dolch, R., Edmonds, D., Freeman, K. L. M., Glaw, F., Grismer, L., Litvinchuk, S., Milne, M. M., Moore, M., Solofo, J. F., Noël, J., Nguyen, T. Q., Ohler, A., Randrianantoandro, C., Raselimanana, A. P., van Leeuwen, P., Wogan, G. O. U., Ziegler, T., Andreone, F. & Murphy, R. W., 2017, Yn: Amphibia-Reptilia. 38, 2, t. 197–207

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    The morphology and electrical conductivity of single-wall carbon nanotube thin films prepared by the Langmuir-Blodgett technique.

    Venet, C., Pearson, C., Jombert, A. S., Mabrook, M. F., Zeze, D. A. & Petty, M. C., 5 Chwef 2010, Yn: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 354, 1-3, t. 113-117

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    A functional dosage compensation complex required for male killing in Drosophila.

    Veneti, Z., Bentley, J. K., Koana, T., Braig, H. R. & Hurst, G. D., 4 Maw 2005, Yn: Science. 307, 5714, t. 1461-1463

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. The taxonomic perspective: The neuropsychological diagnosis of dementia

    Venneri, A., Turnbull, OH. & DellaSala, S., 1996, Yn: European Review of Applied Psychology. 46, 3, t. 179-188

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. E-gyhoeddi cyn argraffu

    Heterogeneous microgeographic genetic structure of the common cockle (Cerastoderma edule) in the Northeast Atlantic Ocean: biogeographic barriers and environmental factors

    Vera, M., Wilmes, S-B., Maroso, F., Hermida, M., Blanco, A., Casanova, A., Iglesias, D., Cao, A., Culloty, S. C., Mahony, K., Orvain, F., Bouza, C., Robins, P., Malham, S., Lynch, S., Antonio, V. & Martínez, P., 18 Awst 2023, (E-gyhoeddi cyn argraffu) Yn: Heredity.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Genomic survey of edible cockle (Cerastoderma edule) in the Northeast Atlantic: a baseline for sustainable management of its wild resources.

    Vera, M., Maroso, F., Wilmes, S-B., Malham, S., Groves, E., Hermida, M., Blanco, A., Fernandez, C., Bouza, C., Martinez, P. & Robins, P., 24 Chwef 2022, Yn: Evolutionary Applications. 15, 2, t. 262-285 24 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    Cognitive training and remediation interventions for substance use disorders: a Delphi consensus study

    Verdejo-Garcia, A., Rezapour, T., Giddens, E., Khojasteh Zonoozi, A., Rafei, P., Berry, J., Caracuel, A., Copersino, M. L., Field, M., Garland, E. L., Lorenzetti, V., Malloy-Diniz, L., Manning, V., Marceau, E. M., Pennington, D. L., Strickland, J. C., Wiers, R., Fairhead, R., Anderson, A., Bell, M., Boendermaker, W. J., Brooks, S., Bruno, R., Campanella, S., Cousijn, J., Cox, W. M., Dean, A. C., Ersche, K. D., Franken, I., Froeliger, B., Gamito, P., Gladwin, T. E., Goncalves, P. D., Houben, K., Jacobus, J., Jones, A., Kaag, A. M., Lindenmeyer, J., McGrath, E., Nardo, T., Oliveira, J., Pennington, C. R., Perrykkad, K., Piercy, H., Rupp, C. I., Schulte, M. H. J., Squeglia, L. M., Staiger, P., Stein, D. J., Stein, J., Stein, M., Stoops, W. W., Sweeney, M., Witkiewitz, K., Woods, S. P., Yi, R., Zhao, M. & Ekhtiari, H., Mai 2023, Yn: Addiction. 118, 5, t. 935-951 17 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Can we better understand severe mental illness through the lens of Syndemics?

    Vereeken, S., Peckham, E. & Gilbody, S., 6 Ion 2023, Yn: Frontiers in Psychiatry. 13, t. e162-73

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Contributions of a global network of tree diversity experiments to sustainable forest plantations

    Verheyen, K., Vanhellemont, M., Auge, H., Baeten, L., Baraloto, C., Barsoum, N., Bilodeau-Gauthier, S., Bruelheide, H., Castagneyrol, B., Godbold, D., Haase, J., Hector, A., Jactel, H., Koricheva, J., Loreau, M., Mereu, S., Messier, C., Muys, B., Nolet, P., Paquette, A., Parker, J., Perring, M., Ponette, Q., Potvin, C., Reich, P., Smith, A. R., Weih, M. & Scherer-Lorenzen, M., 12 Awst 2015, Yn: AMBIO. 45, 1, t. 29-41

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Cost-effectiveness of pharmacogenetic-guided dosing of warfarin in the United Kingdom and Sweden

    Verhoef, T. I., Redekop, W. K., Langenskiold, S., Kamali, F., Wadelius, M., Burnside, G., Maitland-van der Zee, A. H., Hughes, D. & Pirmohamed, M., Hyd 2016, Yn: The Pharmacogenomics Journal. 16, t. 478–484

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Mapping wood production in European forests

    Verkerk, P. J., Levers, C., Kuemmerle, T., Lindner, M., Valbuena, R., Verburg, P. H. & Zudin, S., 1 Rhag 2015, Yn: Forest Ecology and Management. 357, t. 228-238

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Seclusion and enforced medication in dealing with aggression: A prospective dynamic cohort study

    Verlinde, L., Noorthoorn, E., Snelleman, W., Snelleman-van der Plas, M. & Lepping, P., Ion 2017, Yn: European Psychiatry. 39, t. 86-92

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    A Robust Half-Cycle Single-Phase Prefiltered Open-Loop Frequency Estimator for Fast Tracking of Amplitude and Phase

    Verma, A. K., Roncero-Sánchez, P., Ahmed, H., Elghali, S. B. & Busarello, T. D. C., 2 Maw 2022, Yn: IEEE Transactions on Instrumentation and Measurement . 71

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    An Enhanced Single-Phase Self-Tuning Filter based Open-Loop Frequency Estimator for Weak Grid

    Verma, A. K., Ahmed, H., Roncero-Sánchez, P. & Chaturvedi, P., 16 Tach 2021, 2021 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, t. 1020 1025 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadleddadolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Mycolates of Mycobacterium tuberculosis modulate the flow of cholesterol for bacillary proliferation in murine macrophages

    Vermeulen, I., Baird, M., Al-Dulayymi, J., Smet, M., Verschoor, J. & Grooten, J., 1 Ebr 2017, Yn: Journal of Lipid Research. 58, 4, t. 709-718 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Epigenetic divergence during early stages of speciation in an African crater lake cichlid fish

    Vernaz, G., Hudson, A. G., Santos, M. E., Fischer, B., Carruthers, M., Shechonge, A. H., Gabagambi, N. P., Tyers, A. M., Ngatunga, B. P., Malinsky, M., Durbin, R., Turner, G. F., Genner, M. J. & Miska, E. A., Rhag 2022, Yn: Nature Ecology and Evolution. 6, 12, t. 1940-1951 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Mapping epigenetic divergence in the massive radiation of Lake Malawi cichlid fishes

    Vernaz, G., Malinsky, M., Svardal, H., Du, M., Tyers, A. M., Santos, M. E., Durbin, R., Genner, M. J., Turner, G. F. & Miska, E. A., 7 Hyd 2021, Yn: Nature Communications. 12, 1, 5870.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    Slow habituation of induced gamma and beta oscillations in association with unreality experiences in schizotypy.

    Vernon, D., Haenschel, C., Dwivedi, P. & Gruzelier, J., 1 Ebr 2005, Yn: International Journal of Psychophysiology. 56, 1, t. 15-24

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    The parathyroid hormone-responsive B1 gene is interrupted by a t(1;7)(q42;p15) breakpoint associated with Wilms' tumour

    Vernon, E., Malik, K., Reynolds, P., Powlesland, R., Dallosso, A., Jackson, S., Henthorn, K. & Brown, K. W., 5 Maw 2003, Yn: Oncogene. 22, t. 1371-80 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Myc and YY1 mediate activation of the Surf-1 promoter in response to serum growth factors

    Vernon, E. & Gaston, K., 21 Meh 2000, Yn: Biochim. Biophys. Acta. 1492, 1, t. 172-9 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    GABAB receptors couple directly to the transcription factor ATF4

    Vernon, E., Meyer, G., Pickard, L., Dev, K., Molnar, E., Collingridge, G. & Henley, JM., Ebr 2001, Yn: Molecular and Cellular Neuroscience. 17, 4, t. 637-45 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    A functional YY1 binding site is necessary and sufficient to activate Surf-1 promoter activity in response to serum growth factors

    Vernon, E. & Gaston, K., Hyd 1997, Yn: Nucleic Acids Research. 25, 18, t. 3705-11 6 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Bridging the divide between biomedical and psychosocial approaches in dementia research: the 2019 INTERDEM manifesto

    Vernooij-Dassen, M., Moniz-Cook, E., Verhey, F., Chattat, R., Woods, B., Meiland, F., Franco, M., Holmerova, I., Orrell, M. & de Vugt, M., 1 Chwef 2021, Yn: Aging and Mental Health. 25, 2, t. 206-212 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Factors affecting timely recognition and diagnosis of dementia across Europe: from awareness to stigma.

    Vernooji-Dassen, M. J., Moniz-Cook, E. D., Woods, R. T., De Lepelaire, J., Leuschner, A., Zanetti, O., De Rotrou, J., Kenny, G., Franco, M., Peters, V. & Iliffe, S., 1 Ebr 2005, Yn: International Journal of Geriatric Psychiatry. 20, 4, t. 377-386

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    The intraday determination of liquidity in the NYSE LIFFE equity option markets

    Verousis, T., ap Gwilym, O. & Chen, X., 13 Maw 2015, Yn: European Journal of Finance.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Commonality in equity options liquidity: Evidence from European Markets

    Verousis, T., ap Gwilym, O. & Voukelatos, N., 24 Mai 2016, Yn: European Journal of Finance. 22, 12, t. 1204-1223

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    The Impact of a Premium-Based Tick Size on Equity Option Liquidity

    Verousis, T., ap Gwilym, O. & Voukelatos, N., 7 Maw 2016, Yn: Journal of Futures Markets. 36, 4, t. 397-417

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    The implications of a price anchoring effect at the upstairs market of the London Stock Exchange

    Verousis, T. & ap Gwilym, O., Maw 2014, Yn: International Review of Financial Analysis. 32, t. 37-46

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Towards understanding the functional diversity of cell wall mycolic acids of Mycobacterium tuberculosis

    Verschoor, J. A., Baird, M. S. & Grooten, J., 1 Hyd 2012, Yn: Progress in Lipid Research. 51, 4, t. 325-339

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Sugar concentrations along and across the Ricinis communis L. hypocotyls measured by single cell sampling analysis.

    Verscht, J., Tomos, A. D. & Komor, E., 1 Tach 2006, Yn: Planta. 224, 6, t. 1303-1314

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Residual circulation and stratification in the Liverpool Bay region of freshwater influence.

    Verspecht, F., Rippeth, T. P., Simpson, J. H., Souza, A. J., Burchard, H. & Howarth, M. J., 1 Tach 2009, Yn: Ocean Dynamics. 59, 5, t. 765-779

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Processes impacting on stratification in a region of freshwater influence: Application to Liverpool Bay

    Verspecht, F., Rippeth, T. P., Howarth, M. J., Souza, A. J., Simpson, J. H. & Burchard, H., 1 Tach 2009, Yn: Journal of Geophysical Research: Oceans. 114, t. C11022

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Semi-diurnal tidal ellipse variability in a region of freshwater influence

    Verspecht, F., Simpson, J. H. & Rippeth, T. P., 1 Medi 2010, Yn: Geophysical Research Letters. 37, 18, t. 1-4

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Ipsilateral corticospinal projections do not predict congenital mirror movements: a case report

    Verstynen, T., Spencer, R., Stinear, C. M., Konkle, T., Diedrichsen, J., Byblow, W. D. & Ivry, R. B., 2 Maw 2007, Yn: Neuropsychologia. 45, 4, t. 844-852

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Ipsilateral motor cortex activity during unimanual hand movements relates to task complexity.

    Verstynen, T., Diedrichsen, J., Albert, N., Aparicio, P. & Ivry, R. B., 1 Maw 2005, Yn: Journal of Neurophysiology. 93, 3, t. 1209-1222

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Combined control of bottom and turbidity currents on the origin and evolution of channel systems, examples from the Porcupine Seabight.

    Verweirder, L., Van Rooij, D., White, M., Van Landeghem, K., Bossée, K. & Georgiopoulou, A., 1 Rhag 2021, Yn: Marine Geology. 442, 106639.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Understanding help-seeking behaviour in older people with urinary incontinence: An interview study

    Vethanayagam, N., Orrell, A., Dahlberg, L., McKee, K., Orme, S., Parker, S. & Gilhooley, M., Mai 2017, Yn: Health and Social Care in the Community. 25, 3, t. 1061-1069 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Preparation and immunogenicity of gold glyco-nanoparticles as antipneumococcal vaccine model

    Vetro, M., Safari, D., Fallarini, S., Salsabila, K., Lahmann, M., Penades, S., Lay, L., Marradi, M. & Compostella, F., Ion 2017, Yn: Nanomedicine. 12, 1

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Ocean-related options for climate change mitigation and adaptation: A machine learning-based evidence map protocol

    Veytia, D., Airoldi, L., Paris, PSL., Cooley, S., Magnan, A., Marti, V., Neill, S., Sumaila, R., Thebaud, O., Voolstra, C., Williamson, P., Bonin, M., Langridge, J., Comte, A., Viard, F., Shin, Y., Bopp, L. & Gattuso, J-P., 1 Chwef 2024, Yn: Protocol Exchange.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl

  46. Cyhoeddwyd

    Self-assembled monolayers of Vitamin B12 disulphide derivatives on gold.

    Viana, A. S., Kalaji, M. & Abrantes, L. M., 1 Maw 2002, Yn: Electrochimica Acta. 47, 10, t. 1587-1594

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Electrochemical quartz crystal microbalance study of self-assembled monolayers and multilayers of ferrocenylthiol derivatives on gold

    Viana, A. S., Kalaji, M. & Abrantes, L. M., 28 Hyd 2003, Yn: Langmuir. 19, 22, t. 9542-9544

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Redox induced orientational changes in a series of short chain ferrocenyl alkyl thiols self-assembled on gold (1 1 1) electrodes

    Viana, A. S., Jones, A. H., Abrantes, L. M. & Kalaji, M., 16 Maw 2001, Yn: Journal of Electroanalytical Chemistry. 500, 1-2, t. 290-298

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Electrochemical, spectroscopic and SPM evidence for the controlled formation of self-assembled monolayers and organised multilayers of ferrocenyl alkyl thiols on Au (111)

    Viana, A. S., Abrantes, L. M., Jin, G., Floate, S., Nichols, R. J. & Kalaji, M., 1 Ion 2001, Yn: Physical Chemistry Chemical Physics. 3, 16, t. 3411-3419

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    The Lifecycle of Semidiurnal Internal Tides over the Northern Mid-Atlantic Ridge

    Vic, C., Naveira-Garabato, A., Green, M., Spingys, C., Forryan, A., Zhao, Z. & Sharples, J., Ion 2018, Yn: Journal of Physical Oceanography. 48, 1, t. 61-80

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid