J.H. Saunders , "Chemical Constitution and Physical Properties of Polyurethane Elastomers," Journal of IR I, London, Vol. 2, No. 1, February 1968.
3.
BASF Wyandotte Corporation, North American Urethanes Division , Uniontown, Ohio, Urematic Multiple Components Mixing Head, Type 314-5D.
4.
Krauss-Maffei München, Plastics Machinery Division, Munchen, West Germany, Production Series KM-PU.
5.
Motor Wheel Corporation, Press Release #1077-70 of January 21, 1970.
6.
W. H. Miner, Inc., Office of International Operations, Washington, D.C., Shock Absorption Research and Development Complex, Dedicated to Technical Advance of Railroad Shock Protection