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- [6] PROCEEDINGS FROM THE 7TH SYMPOSIUM OF THE WORKING GROUP ON INTERDISCIPLINARY RESEARCH IN TROPICAL MEDICINE, HEIDELBERG HELD ON 28-29 FEBRUARY 1992 IN HEIDELBERG, FOCUSING ON OPERATIONAL-RESEARCH IN HEALTH PROJECTS ABSTRACTS TROPICAL MEDICINE AND PARASITOLOGY, 1992, 43 (04): : 287 - 294