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Nägler, Th.F.; Villa, I.M. (2000). In pursuit of the 40K branching ratios: K-Ca and 39Ar–40Ar dating of gem silicates. Chemical geology, 169(1-2), pp. 5-16. Elsevier 10.1016/S0009-2541(99)00194-1
Bird, J.M; Meibom, A.; Frei, R; Nägler, Th.F. (1999). Osmium and lead isotopes of rare OsIrRu minerals: derivation from the core–mantle boundary region? Earth and planetary science letters, 170(1-2), pp. 83-92. Elsevier 10.1016/S0012-821X(99)00101-6
