Thé, C., H. Mafouasson, H. Calba, P. Mbouemboue, C. Zonkeng, A. Tagne, and W. J. . Horst. “Identification of Heterotic Groups for the Tolerance of Maize (Zea Mays L.) for Tropical Acid Soils”. Cahiers Agricultures, vol. 15, no. 4, July 2006, pp. 337-346 (1), https://revues.cirad.fr/index.php/cahiers-agricultures/article/view/30593.