Application of High-Performance Thin Layer Chromatography and near Infrared Spectroscopy in the Validation of in-use Stability of Herbal Medicines used in the Management of Covid-19. (2023). The East and Central African Journal of Pharmaceutical Sciences, 25(1), 31-40. http://jsep.uonbi.ac.ke/ojs/index.php/ecajps/article/view/1483