U. E. Uche, “Forecasting Economic Life of Rubber Plantation using Markov Model”, Direct Res. J. Agric. and Food Sci., vol. 12, no. 2, pp. 263–273, Aug. 2024, Accessed: Oct. 11, 2025. [Online]. Available: https://journals.directresearchpublisher.org/index.php/drjafs/article/view/92