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Vanyperen, G. H., Matthey, A. P. M., Walraven, J. T. M., & Silvera, I. F. (1981). Adsorption Energy and Nuclear-Relaxation of H-Down on He-3-He-4 Mixtures. Physical Review Letters, 47(11), 800-803. https://doi.org/10.1103/PhysRevLett.47.800 -
Ellman, M. J. (1981). Agricultural Productivity under Socialism. World Development, 9(9-10), 979-989. https://doi.org/10.1016/0305-750X(81)90054-1
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Silvera, I. F., & Wijngaarden, R. J. (1981). New Low-Temperature Phase of Molecular Deuterium at Ultrahigh Pressure. Physical Review Letters, 47(1), 39-42. https://doi.org/10.1103/PhysRevLett.47.39 -
Raaijmakers, J. G. W. (1981). A general framework for the analysis of concept identification tasks. Acta Psychologica, 49(3), 233-261. https://doi.org/10.1016/0001-6918(81)90018-4
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