Abate A, Dimartino V, Spina P, Costa PL, Lombardo C, Santini A, Del Piano M, Alimonti P. Hymecromone in the treatment of motor disorders of the bile ducts: a multicenter, double-blind, placebo-controlled clinical study. Drugs Exp Clin Res. 2001;27(5-6):223–31. PMID: 11951580.