Doehring-Schwenrdtfeger, Ekkehard; Abdel-Rahim, Ibrahim M.; Ali, Qurashi Mohamed; Elsheikh, Mamoun; Schlake, Jens; Kardorff, Rudiger; Franke, Doris; Kaiser, Christoph; Ehrich, Jochen H. H.
(The American Journal of Tropical Medicine and Hygiene, 1990)