D. N. Osujieke, Y. A. Awwal, and H. O. Muhammad, “Evaluation of Land Constraints to Yam (Dioscorea rotundata) Production in Wukari Area, Northeastern Nigeria”, NG Agric. Sci., vol. 2, no. 2, pp. 31–42, Jun. 2026, doi: 10.66132/ngas020204.