1. Multiple primary malignant tumors; a survey of the literature and statistical study;Billroth;Am. J. Cancer,1932
2. Multiple primary carcinoma;Hanlon;Am. J. Cancer,1931
3. Multiple primary malignant lesions;Stalker;Surg. Gynec. & Obst.,1939
4. Multiple primary cancers;Burke;Am. J. Cancer,1936
5. Cancer of the esophagus, some etiologic considerations;Watson;Am. J. Roentgenol.,1939