1. G. Maycock, Rubber Chemistry and Technology, Vol. 41, p. 780, 1968.
2. B. J. Allbert, J. C. Walker, Rubber Chemistry and Technology, Vol. 41, p. 753, 1968.
3. A. Schallamach, Journal of Institute of Rubber Ind., Vol. 4, p. 251, 1970.
4. W. B. Horne, Astronautics and Aeronautics, August, 1967.
5. “Skidding Accidents” brochure published by Institute for Road Safety. Research — SWOV Voorburg, 2110, The Netherlands.