1. Kol’tsov, S.I., Zh. Prikl. Khim., 1967, vol. 40, no.4, p. 907.
2. Kol’tsov, S.I. and Aleskovskii, V.B., Zh. Fiz. Khim., 1968, vol. 42, no.5, pp. 1210–1214.
3. Kohlschutter, H.W. and Bogel, U., Fortschr. Kolloide Polym., 1971, vol. 55, no.1, pp. 29–33.
4. Velikova, M., Damyanov, D., and Mehandjiev, D., BAS Commun. Depart. Chem., 1979, vol. 12, no.4, pp. 647–651.
5. Chuiko, A.A., Tertykh, V.A., Kazakov, K.P., et al., Adsorbts. Adsorbenty, 1980, no. 8, pp. 34–42.