@INBOOK {KANG:1990,
title = {Long-tern fertilizer trials on alfisols in West Africa},
author = {Kang, B. and Balasubramanian, V. },
year = {1990},
type = {Transactions, 14th International Congress of Soil Science, Vol. IV, 12-18 Aug 1990},
pages = {20--25},
address = {Kyoto, Japan},
}