H. K. Hanumappa, D. D’Souza, J. S. Rao, F. R. Naduvathkundil, R. G. Chowdappa, and E. P. Joseph, Trans., “Gastrointestinal mixed neuroendocrine carcinoma: Case reports and review of literature”, Indian J Case Reports, vol. 4, no. 5, pp. 340–343, Oct. 2018, doi: 10.32677/IJCR.2018.v04.i05.001.