1. Worth, A. H., The Chemistry and Technology of Waxes, second ed. (Reinhold, New York, 1956).
2. Holde, D., and Bleyberg, W., Metallbörse, 20, 1855 (1930).
3. Fuch, W., and Dieberg, R., Fette, Siefen, Anstrich, 58 (10), 826 (1956).
4. Metcalfe, L. D., Nature, 188, 142 (1960).