Mehta, V., B. Bhattachan, and C. Balachandran. “Co-Occurrence of Isotopic and Isomorphic phenomenon in the Same Individual”. Journal of Pakistan Association of Dermatologists, vol. 19, no. 4, Dec. 2016, pp. 250-1, https://www.jpad.com.pk/index.php/jpad/article/view/554.