Williams, E. J., The Loss of Energy by β -Particles and Its Distribution between Different Kinds of Collisions, Proceedings of the Royal Society of London. Series A, 1931, 130 (813): 328–346, Bibcode:1931RSPSA.130..328W, doi:10.1098/rspa.1931.0008
Williams, E. J., The Loss of Energy by β -Particles and Its Distribution between Different Kinds of Collisions, Proceedings of the Royal Society of London. Series A, 1931, 130 (813): 328–346, Bibcode:1931RSPSA.130..328W, doi:10.1098/rspa.1931.0008