1. R. L. Merker, US Patent No. 3041362 (June 26, 1962);
2. RZhKhim No. 23T, 209P (1963).
3. W. Simmler, H. Niederprüm, and H. Walz, Chem. Ber.,97, 1047 (1964).
4. K. A. Andrianov, N. V. Delazari, L. M. Volkova, Ts. Ya. Rosinskaya, and N. A. Alyavdin, Izv. Akad. Nauk SSSR, Ser. Khim., 1269 (1969).
5. N. A. Alyavdin and T. S. Novoradovskaya, The Use of Mathematical Statistics in the Textile Industry [in Russian], Legkaya Industriya (1969).