Vallée, Gilbert, Mathurin M’Biandoun, and Francis Forest. “Direct Sowing Systems in the Garoua Zone (North Cameroun)”. Cahiers Agricultures 5, no. 3 (May 1, 1996): 161–169 (1). Accessed August 25, 2024. https://revues.cirad.fr/index.php/cahiers-agricultures/article/view/29942.