Kellokumpu-Lehtinen, P., R. Huovinen, and V. Nikkanen. 1990. “Survival and Esophageal Passage After Radiotherapy of Inoperable Esophageal Carcinoma: A Retrospective Study of 106 Cases”. Acta Oncologica 29 (2):175-78. https://doi.org/10.3109/02841869009126541.