SHUBHAM MUKHERJEE, DIPANJANA ASH, GOPA ROY BISWAS, and SUTAPA BISWAS MAJEE, “COMPARATIVE STUDY OF SPAN 40 AND SPAN 60 BASED SOY-GELS FOR TOPICAL DRUG DELIVERY”, Asian J Pharm Clin Res, vol. 12, no. 6, pp. 259–265, Jun. 2019.