1. Pyatnitskii, I.V. and Sukhan, V.V., Analiticheskaya khimiya serebra (Silver Analytical Chemistry), Moscow: Nauka, 1975.
2. Fishkova, N.L. and Kurskii, A.N., Zavod. Lab., 1989, vol. 55, no. 8, p. 34.
3. Yudelevich, I.G. and Startseva, E.A., Atomno-absorbtsionnoe opredelenie blagorodnykh metallov (Atomic Absorption Determination of Noble Metals), Novosibirsk: Nauka, 1981.
4. Bazhov, A.S. and Sokolova, E.A., Zh. Anal. Khim., 1977, vol. 32, no. 1, p. 65.
5. Doležal, J., Povondra, P., and Šumcek, Z., Rozklady zakladnich anorganickych surovin (Methods for Decomposition of Rocks and Minerals), Prague: SNTL, 1966.