Butt, G., M. A. Ibrahim, A. Maqsood, B. Bashir, and I. Hussain. “Hyperkeratotic, Tender, Firm Lesions on Left Leg of a 22 Years Old Male”. Journal of Pakistan Association of Dermatologists, vol. 29, no. 1, Sept. 2019, pp. 137-40, doi:10.66344/jpad.29.1.2019.1419.