Fonseka, Sanjeewani, et al. “Treatment of Difficult-to-Treat-Dermatophytosis: Results of a Randomized, Double-Blind, Placebo-Controlled Study”. The Journal of Infection in Developing Countries, vol. 15, no. 11, Nov. 2021, pp. 1731-7, doi:10.3855/jidc.14666.