Nihad Hussein Ahmed, et al. “Effect of Tadalafil in Comparison With Clobetasol Ointment in Induced Psoriasis in Mice Male”. Tikrit Journal of Pharmaceutical Sciences, vol. 16, no. 1, Dec. 2022, pp. 9-18, doi:10.25130/tjphs.2022.16.1.2.9.18.