P. C. Fragkou, I. A. Papadopoulos, A. Papadopoulos, E.-A. Kontoveros, G. Kaltsas, and F. Vassilara, “Rare Presentation of a Metastatic Pancreatic Neuroendocrine Neoplasm Presenting with Atrial Flutter”, EJCRIM, vol. 8, no. 1, Jan. 2021.