1. A. P. Avtsyn, T. I. Lukomskii, L. K. romanova, et al., Sov. Med., No. 7, 8 (1952).
2. R. V. Merkur'eva, N. N. Litvinov, B. V. Aulika, et al., Byull. Éksp. Biol. Med., No. 4, 41 (1982).
3. R. V. Merkur'eva, B. V. Aulika, V. V. Fetisov, et al., Carcinogenic N-Nitroso Compounds and their Precursors: Formation and Determination in the Envorinment [in Russian], Tallin (1984), p. 113.
4. G. I. Sidorenko and N. N. Litvinov, The State and Prospects of Development of Environmental Hygiene [in Russian], Moscow (1985), p. 4.
5. V. V. Fetisov and Z. M. Gasimova, Arkh. Anat., No. 3, 84 (1985).