A. Okunlola, M. A. Odeniyi, and M. I. Arhewoh, “Microsphere formulations of ambroxol hydrochloride: influence of Okra (Abelmoschus esculentus) mucilage as a sustained release polymer”, Prog. Biomater., vol. 9, no. 1-2, Jun. 2020, doi: 10.1007/s40204-020-00132-5.