Tschandl, Philipp, Cliff Rosendahl, Richard Williamson, and David Weedon. 2012. “A Keratoacanthoma With Venous Invasion”. Dermatology Practical & Conceptual, October, 9-11. https://dpcj.org/index.php/dpc/article/view/dermatol-pract-concept-articleid-dp0204a03.