1. L. J. Bellamy, The Infrared Spectra of Complex Molecules (Halsted Press, New York, 1975).
2. L. D. Kislovskii, R. G. Knubovets, and G. I. Cherenkova, “Indicators of condensation of tetrahedrons in apatite,” Dokl. Akad. Nauk SSSR 232 3, 581–583 (1977).
3. R. G. Knubovets, “Some crystalline chemical structural features of real structure of calcium phosphates,” in Analysis of Calcium Phosphates by Physical Methods (Nauka, Novosibirsk, 1979), pp. 22–29.
4. D. Corbridge, Structural Chemistry of Phosphorus, (Elsevier, Amsterdam, 1974).
5. A. Yu. Kudeyarova, “Trend and mechanisms of transformation of natural sorption barriers in acid soils under phosphate loading,” Geochem. Int. 51 4, 290–305 (2013).