1. Suetinov, A.A., Klassen, P.V., Kuznetsova, A.G., Starodubtsev, V.S., Gabeskiriya, O.V., and Mikaev, B.T., Obz. Inf. NIITEKhIM, Ser.: Mineral. Udobr. Ser. K-ta (Overview NIITEHIM, Ser.: Mineral Fertilizers and Sulf. Acid), Moscow, NIITEHIM, 1984, p. 29.
2. Suetinov, A.A., Novikov, A.A., Yanishevskii, F.V., Mikaev, B.T., Gabeskiriya, O.V., Kuznetsova, A.G., Levin, V.I., and Starodubtsev, V.S., Overview Obz. Inf. NIITEKhIM, Ser.: Mineral. Udobr. Ser. K-ta (Overview NIITEHIM, Ser.: Mineral Fertilizers and Sulf. Acid), Moscow, NIITEHIM, 1987, p. 57.
3. Suetinov, A.A., Novikov, A.A., Starodubtsev, V.S., Mikaev, B.T., Gabeskiriia, O.V., Yanishevskii, F.V., and Kuvshinnikova, O.I., Obz. Inf. NIITEKhIM, Ser.: Mineral. Udobr. Ser. K-ta (Overview NIITEHIM, Ser.: Mineral Fertilizers and Sulf. Acid), Moscow, NIITEHIM, 1990, p. 56.
4. Iretskaya, S.N., Yarosh, E.B., and Pozin, M.E., Zh. Prikl. Khim., 1991, vol. 64, № 11, pp. 2225–2228.
5. Iretskaya, S.N., Yarosh, E.B., and Dmitrievskii, B.A., Zh. Prikl. Khim., 1993, vol. 66, no. 9, pp. 1921–1926.