Survey of plants for antimalarial activity - Spencer,C.F.; Koniuszy,F.R.; Rogers,E.F.; Shavel J,J.r.; Easton,N.R.; Kaczka,E.A.; Kuehl FA,J.r.; Phillips,R.F.; Walti,J.; Folkers,K.; Malanga,C.; Seeler,A.O. (Lloydia, 1947)