1. [a] Comprehensive texts: in and : �ber Sterine, Gallens�uren und verwandte Naturstoffe (Sterols, Bile Acids and Related Natural Products). F. Enke, Stuttgart 1954, vol. 1. p. 287.
2. [c] and : Steroids. Reinhold Publishing Corp., New York 1959, p. 727.
3. Review: and Advances in Carbohydrate Chemistry, vol. 17 (1962) in press.