1. E.Ya.Vaiman, A.B.Pakshver, and V.D.Fikhman, in ?Carbochain Fibres? (in Russian), Khimiya (1960), p.146.
2. E.Ya.Vaiman, Yu.V.Glazkovskii, P.V.Smirnov, and V.D.Fikhman, Zh.Prikl.Khim., No.2 (1968).
3. E.Ya.Vaiman, A.B.Pakshver, and V.D.Fikhman, in ?Fibres from Synthetic Polymers? (in Russian), Khimiya (1970), p.209.
4. E.Ya.Vaiman, V.D.Fikhman, and L.G.Repina, Authors' Certificate USSR No.246775; Byll. izobr.i tov.znakov, No.21 (1969).
5. E.Ya.Vaiman and V.D.Fikhman, Authors' Certificate USSR No.235989; Byull.izobr.i. tov.znakov, No.6 (1969).