Alinak Gundogan, G., A. Ege Gul, E. Gundogan, and N. Karadayi. “Relation of PTEN and Ki67 Expression With Prognosis in Gastrointestinal Stromal Tumors”. Annals of Medical Research, vol. 27, no. 2, May 2021, pp. 0510-6, http://annalsmedres.org/index.php/aomr/article/view/627.