AN OUTBREAK OF PLASMODIUM-VIVAX MALARIA AMONG HEROIN USERS IN SPAIN - Peña Sanchez de Rivera, Jose Maria; Arnalich Fernandez, Francisco; Garcia, Jjg; Pena, JM; Garciaalegria, JJ; Fernandez, FG; Herraez, CJ; Vazquez, JJ (Transactions Of The Royal Society Of Tropical Medicine And Hygiene, 1986)