S. P. A. OKORO, I. T. AIGHEWI, and C. O. OSAGIE, “Effect of selected monoculture plantation species on the humid tropical soils of southern Nigeria”, Indian J Agri Sci, vol. 70, no. 2, Mar. 2013, Accessed: Oct. 28, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/28043