Mehta, F. F.; Rajagopalan, R.; Trivedi, P. Formulation and Characterization of Caffeine Biodegradable Chewing Gum Delivery System for Alertness Using Plasticized Poly (D,L-Lactic Acid) As Gum Base. Trop. J. Pharm Res 2017, 16, 1489-1496.