@BOOK {CLAASSEN:1992a, title = {Les pulverisateurs en station de recherche agronomique: Guide de recherche de l'Iita, No. 16}, author = {Claassen, S. L. }, series = {Guide de recherche de l'Iita, No. 16}, year = {1992}, month = {February}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {48p.}, }