Aland, Rajkumar, et al. “Solid Lipid Nanoparticles for Topical Delivery of Acitretin for the Treatment of Psoriasis by Design of Experiment”. International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN), vol. 12, no. 2, Mar. 2020, pp. 4474-91, doi:10.37285/ijpsn.2019.12.2.5.