Hubacher, MH; Doernberg, S; Horner, A (1953). "Laxatives: chemical structure and potency of phthaleins and hydroxyanthraquinones". Journal of the American Pharmaceutical Association. 42 (1): 23–30. doi:10.1002/jps.3030420108. PMID13034620.
Hubacher, MH; Doernberg, S; Horner, A (1953). "Laxatives: chemical structure and potency of phthaleins and hydroxyanthraquinones". Journal of the American Pharmaceutical Association. 42 (1): 23–30. doi:10.1002/jps.3030420108. PMID13034620.