1. F. W. Storm Van Leeuwen, International Congress on Technical Plastics Processing (N.V.'t Raedthuis, Amsterdam, 1961) p. 348.
2. N. V. Kulikov,Sov. Plast. 5 (1963) 28.
3. J. Bax,Plast. Polymers 38 (1970) 27.
4. G. Epstein andW. Bandaruk, Proceedings of the 19th Annual Conference, Reinforced Plastics Division (Soc. Plast. Ind., 1964) Section 19-D.
5. J. A. Kies, U. S. Naval Research Laboratory Report No. 5752 (1962).