1. R.Lie and M.Cune, Text.Res.J.32, No.9 (1962).
2. V.S.Zakharov, E.P.Krasnov, T.A.Smirnova, and A.A.Konkin, in ?Synthetic Fibres? (in Russian), Khimiya (1969), 131.
3. A.M.Shchetinin, Khim.volokna, No.5 (1968);
4. A.M.Shchetinin and G.I.Kudryavtsev, Khim.volokna, No. 1 (1968).
5. Preston, Smith, and Steman, in ?New Developments in Man-Made Fibre Production? (Russian translation), Mir (1968), 7.