1. V. N. Pereverzev and E. A. Koshleva, “Fractional Composition of Phosphates of Cultivated Podzolic Soils of the Murmansk District,” Agrokhimiya, No. 5, 10–20 (1990).
2. V. N. Efimov and A. I. Ivanov, “Hidden Degradation of Well Cultivated Soils of Russia,” Agrokhimiya, No. 6, 5–10 (2001).
3. E. Barberis, F. A. Marsan, R. Scalenghe, A. Lammers, U. Schwertmann, A. C. Edwards, R. Maguire, M. J. Wilson, A. Delgado, and J. Torrent, “European Soils Over-fertilized with Phosphorus. I. Basic Properties,” Fertil. Res. 45(3), 199–207 (1996).
4. A. Yu. Kudeyarova, Phosphatogenic Transformation of Soils (Nauka, Moscow, 1995) [in Russian].
5. S. A. Shafran, “Dynamics of Soil Fertility versus Application of Fertilizers,” Agrokhimiya, No. 1, 9–17 (2004).