1. S. Z. Kaplan and I. F. Radzevenchuk, Viscosity Improvers and Polymer-Thickened Oils [in Russian], Khimiya, Leningrad (1982), pp. 8?9.
2. A. P. Alekseev, G. F. Bol'shakov, and G. A. Safonov, in: Chemmotology ? Theory and Practice of Rational Utilization of Fuels and Lubricants in Vehicles and Equipment [in Russian], MDNTP im. F. É. Dzerzhinskii, Moscow (1988), pp. 66?70.
3. A. A. Strepikheev, V. A. Derevitskaya, and G. L. Slonimskii, Principles of Chemistry of Macromolecular Compounds, 2nd edn. [in Russian], Khimiya, Moscow (1967), p. 377.