In vitro and in vivo chloroquine-potentiating action of Strychnos myrtoides alkaloids against chloroquine-resistant strains of Plasmodium malaria - Rasoanaivo,P.; Ratsimamanga-Urverg,S.; Milijaona,R.; Rafatro,H.; Rakoto-Ratsimamanga,A.; Galeffi,C.; Nicoletti,M. (Planta Medica, 1994)