Patel, A. “In Vitro and In Vivo Evaluation of Chitosan/Karaya Gum Interpolymer Complex Based Mucoadhesive Buccal Films of Tramadol HCl”. Asian Journal of Pharmaceutics (AJP), vol. 11, no. 04, Feb. 2018, doi:10.22377/ajp.v11i04.1721.