8TANTISHAIYAKUI. V, POEAKNAPO C, SRIBUN P, et al, Simuhaneous determination of dextromethorphan HBr and bromhexine HCI in tablets by first-derivative spectrophotometry [J]. J Pharm Biomed Anal, 1998,17(2):237-243.
9RAUHA J P, SALOMIES H, AALTO M. Simultaneous determination of bromhexine hydrochloride and methyl and propyl p-hydroxybenzoate and determination of dextromethorphan hydrobromide in cough-cold syrup by high performance liquid chromatography[J]. J Pharm Biomed Anal, 1996,15(2):287-293.