@BOOK {COUPER:1994b, title = {Ressources aquatiques en station de recherche agricole: Guide de recherche de l'Iita No. 23}, author = {Couper, D. C. }, series = {Guide de recherche de l'Iita No. 23}, year = {1994}, month = {June}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {19p.}, }