@ARTICLE {OKIGBO:1987e, title = {Towards a new green revolution: from chemicals to new biological techniques in the improvement of tropical African Agriculture.}, author = {Okigbo, B. }, journal = {Accademia Naziionale Delle Scienze Detta Dei XL Memoria di Scienze Fisiche e Naturali}, year = {1987}, volume = {112}, number = {V}, pages = {457--481}, }