Campbell, J. L.; Leiper, W.; Ledingham, K. W. D.; Drever, R. W. P. The ratio of K-capture to positron emission in the decay of 11C. Nuclear Physics A. 1967-04-11, 96 (2): 279–287. Bibcode:1967NuPhA..96..279C. doi:10.1016/0375-9474(67)90712-9.
Campbell, J. L.; Leiper, W.; Ledingham, K. W. D.; Drever, R. W. P. The ratio of K-capture to positron emission in the decay of 11C. Nuclear Physics A. 1967-04-11, 96 (2): 279–287. Bibcode:1967NuPhA..96..279C. doi:10.1016/0375-9474(67)90712-9.