Activity on the CNS of Crude Extracts and of Some Diterpenoids Isolated from Euphorbia calyptrata Suspended Cultures - Speroni, Ester; Coletti, Barbara; Minghetti, Anacleto; Perellino, Nicoletta Crespi; Guicciardi, Augusto; Vincieri, Franco Francesco (Planta Medica, 1991)