1. O.I.Nachinkin, I.G.Ruban, M.D.Gluz, and V.I.Kolosov, Fibre Chemistry, No.2 (1971).
2. N.V.Demina, A.V.Motorina, et al., Physico-Mechanical Methods of Testing Man-Made Fibres, Yarns and Films (in Russian), Legkaya Industriya (1964).
3. Paper and Paper Products (in Russian), Committee of Standards, Measures and Measuring Instruments (1969).
4. V.S.Zakharov, V.A.Myagkov, I.D.Lokhova, and A.A.Konkin, Khim.Volokna, No.1 (1968).
5. I.O.Nachinkin and I.G.Ruban, Fibre Chemistry, No.6 (1971).