P. KUMAR, B. SHRIVASTAVA, M. M. GUPTA, and A. K. SHARMA, “OPTIMIZATION AND PREPARATION OF SOLID LIPID NANOPARTICLE INCORPORATED TRANSDERMAL PATCH OF TIMOLOL MALEATE USING FACTORIAL DESIGN”, Int J App Pharm, vol. 11, no. 6, pp. 100–107, Nov. 2019.