1. Beamish, F.E., The Analytical Chemistry of the Noble Metals, Oxford: Pergamon, 1966, vol. 2.
2. Analiticheskaya khimiya metallov platinovoi gruppy (Analytical Chemistry of Platinum Group Metals), Moscow: URSS, 2003, p. 591.
3. Barefoot, R.R. and Van Loon, Talanta, 1999, vol. 49, no. 1, p. C. 1.
4. Borovik-Romanova, T.F., Belyaev, Yu.I., Kutsenko, N.I., Pavlenko, L.I., Savinova, E.N., and Farafonov, M.M., Spektral’noe opredelenie redkikh i rasseyannykh elementov (Spectral Determination of Rare and Scattered Elements), Moscow: Akad. Nauk SSSR, 1962.
5. Lontsikh, S.V., Nedler, V.V., Raikhbaum, Ya.D., and Khokhlov, V.V., Spektral’nyi analiz pri poiskakh rudnykh mestorozhdenii (Spectral Analysis in the Search for Ore Deposits), Leningrad: Nedra, 1969.