Wilcken, K.~M.; Barrows, T. T.; Fifield, L. K.; Tims, S. G.; Steier, P. (junio de 2007). «AMS of natural 236 U and 239Pu produced in uranium ores». Nuclear Instruments and Methods in Physics Research B259: 727-732. Bibcode:2007NIMPB.259..727W. doi:10.1016/j.nimb.2007.01.210.
Wilcken, K.~M.; Barrows, T. T.; Fifield, L. K.; Tims, S. G.; Steier, P. (junio de 2007). «AMS of natural 236 U and 239Pu produced in uranium ores». Nuclear Instruments and Methods in Physics Research B259: 727-732. Bibcode:2007NIMPB.259..727W. doi:10.1016/j.nimb.2007.01.210.