@INBOOK {YANINEK:1989b,
title = {Identifying pest problems in relation to implementing biological control in Africa},
author = {Yaninek, J. and Cock, M. },
year = {1989},
type = {Biological control: a sustainable solution to crop pest problems in Africa, edited by J.S. Yaninek and H.R. Herren},
pages = {116--126},
}