WRAY, P E The application of ultrasonic energy to the extraction of belladonna leaf U.S.P. [electronic resource] - Journal of the American Pharmaceutical Association. American Pharmaceutical Association Nov 1958 - 823-6 p. digital Publication Type: Journal Article Standard No.: 10.1002/jps.3030471118 doi Subjects--Topical Terms: Atropa belladonnaBelladonna AlkaloidsGastrointestinal AgentsParasympatholyticsUltrasonics