Akpabio, E.I., U. S. Ekong, T. O. Uwah, E. D. Ekpa, P. M. E. Ubulom, G. E. Jacobs, and M. E. Fred. 2020. “Formulation and Evaluation of Theophylline Sustained Release Tablet Using Lasianthera Africana Gum”. Nigerian Journal of Pharmaceutical and Applied Science Research 5 (2):41-48. https://nijophasr.net/index.php/nijophasr/article/view/125.