1. Tumors of the extra-adrenal Paraganglion system (including chemoreceptors);Glenner,1974
2. Soft Tissue Tumors;Enzinger,1988
3. Extra-adrenal pheochromocytoma: literature review and report of a cervical pheochromocytoma;Fries;Surgery,1968
4. Experience with extra-adrenal pheochromocytoma;Goldfarb;J. Urol.,1989
5. The Natural History of the Chromaffin Cell;Coupland,1965