Macalou, S., S. Mwonga, and A. Musandu. “Performance of Two Cassava (Manihot Escculenta Crantz) Genotypes to NPK Fertilizer in Ultisols of Sikasso Region, Mali”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 38, no. 2, May 2018, pp. 189-06, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8942.