Sundararaman P, Djerassi C (October 1977). "A convenient synthesis of progesterone from stigmasterol". The Journal of Organic Chemistry. 42 (22): 3633–4. doi:10.1021/jo00442a044. PMID915584.
Gallina G, Ferretti G, Merlanti R, Civitareale C, Capolongo F, Draisci R, Montesissa C (October 2007). "Boldenone, boldione, and milk replacers in the diet of veal calves: the effects of phytosterol content on the urinary excretion of boldenone metabolites". Journal of Agricultural and Food Chemistry. 55 (20): 8275–83. doi:10.1021/jf071097c. PMID17844992.
Sundararaman P, Djerassi C (October 1977). "A convenient synthesis of progesterone from stigmasterol". The Journal of Organic Chemistry. 42 (22): 3633–4. doi:10.1021/jo00442a044. PMID915584.
Gallina G, Ferretti G, Merlanti R, Civitareale C, Capolongo F, Draisci R, Montesissa C (October 2007). "Boldenone, boldione, and milk replacers in the diet of veal calves: the effects of phytosterol content on the urinary excretion of boldenone metabolites". Journal of Agricultural and Food Chemistry. 55 (20): 8275–83. doi:10.1021/jf071097c. PMID17844992.