@BOOK {CLAASSEN:1992,
title = {Produits agrochimiques en station de recherche: Guide de recherche de l'Iita, No. 17},
author = {Claassen, S. L. },
series = {Guide de recherche de l'Iita, No. 17},
year = {1992},
month = {February},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {12p.},
}