1. E. V. Arinushkina, Manual for the Chemical Analysis of Soils (Moscow State Univ., Moscow, 1962) [in Russian].
2. T. V. Aristovskaya, Microbiology of Pedogenic Processes (Nauka, Leningrad, 1980) [in Russian].
3. T. V. Aristovskaya, “Role of microorganisms in mobilization and fixation of iron in soils,” Pochvovedenie, No. 4, 87–91 (1975).
4. B. P. Akhtyrtsev, Gray Forest Soils of Central Russia (Voronezh State Univ., Voronezh, 1979) [in Russian].
5. K. E. Ginzburg and L. V. Lebedeva, “Determination method of mineral forms of phosphorous in soils,” Agrokhimiya, No. 1, 25–68 (1971).