1. T. P. Gronskaya, I. I. Silina, and I. N. Varfolomeeva, Zhizn' Bezopasnost', No. 2–3, 307–314 (1997).
2. Regional Standard. Standards and Criteria for Assessing Pollution of Bottom Sediments in the Waters of St. Petersburg [in Russian], St. Petersburg (1996), p. 19.
3. Ekokhronika, No. 4(42), 5 (1999).
4. I. O. Plekhanova, Yu. D. Kutukova, and A. I. Obukhov, Pochvovedenie, 1530–1536 (September, 1995).
5. B. A. Yagodin, I. P. Deryugin, et al., Agrochemistry Handbook [in Russian], Agropromizdat, Moscow (1987).