Dwivedi, D., and A. Srivastava. “Comparative Study of Anti-Acne Gel Formulations With Thymus Vulgaris, Tretinoin, and Their Combined Therapeutic Effect”. International Journal of Health Care and Biological Sciences, Vol. 4, no. 4, Dec. 2023, pp. 15-22, https://saapjournals.org/index.php/ijhcbs/article/view/945.