G. ANJANDE, V. U. IJIRSHAR, S. T. ASOM, S. E. AKIRI, and J. T. SOKPO, “REVISITING THE ACCURACY OF RICARDIAN THEORY OF COMPARATIVE ADVANTAGE IN AFRICA IN THE 21ST CENTURY: AN EMPIRICAL VERIFICATION”, JEARECONS, vol. 4, no. 3, pp. 25–44, Sep. 2020.