Akinrinde, E.A., and T. Gaizer. “Differences in the Performance and Phosphorus-Use Efficiency of Some Tropical Rice (Oryza Sativa L.) Varieties”. Pakistan Journal of Nutrition, vol. 5, no. 3, Apr. 2006, pp. 206-11, https://doi.org/10.3923/pjn.2006.206.211.