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