Cerrah, S., A. Ramiz Baykan, S. Ciftel, and E. Gerceker. “From the Point of View of a Gastroenterologist: Is the Ulcer Malign, or Benign?”. Annals of Medical Research, vol. 27, no. 11, May 2021, pp. 2954-7, http://annalsmedres.org/index.php/aomr/article/view/1046.