Smith, Andrew J., Patrick Whelan, Bernard J. Cummings, and Hartley S. Stern. “Management of Persistent or Locally Recurrent Epidermoid Cancer of the Anal Canal With Abdominoperineal Resection”. Acta Oncologica 40, no. 1 (January 1, 2001): 34–36. Accessed May 18, 2026. https://medicaljournalssweden.se/actaoncologica/article/view/26004.