D. D. Nyam, A. E. Angyu, K. E. Deshi, S. N. Dawang, H. Susinya, and O. P. Ifenkwe, “Effect of Photoperiod on the Germination and Seedling Development of Some (Acha) Digitaria Species”, IJSBAR, vol. 35, no. 2, pp. 167–175, Aug. 2017.