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2. Bulgakov, N.G., Indication of the State of Natural Ecosystems and Standardization of Environmental Factors: Review of the Current Methods, Usp. Sovrem. Biol., 2002, vol. 122, no. 2, pp. 115–135.
3. Bulgakov, N.G., Levich, A.P., and Maksimov, V.N., Regional’nyi ekologicheskii kontrol’ na osnove bioticheskikh i abioticheskikh dannykh monitoringa (Regional Environmental Monitoring Based on Biotic and Abiotic Monitoring Data), Nizhnii Novgorod: Izd. Nizhegorodskogo univ., 2003.
4. GOST (State Standard) R 51898-2002: Safety Aspects. Rules for Inclusion into Standards, 2002.
5. GOST (State Standard) R ISO 5725-2-2002: Accuracy (Correctness and Precision) of Methods and Results of Measurements, 2002.