1. Nonfunctional, nonchromaffin paragangliomas of the retroperitoneum;Olson;Cancer,1969
2. Recent advances in the ultrastructure of the carotid body;Hellström,1984
3. Malignant non-chromaffin paraganglioma of the retroperitoneum;Adams;J. Med. Ass. State Alabama,1977
4. Extra-adrenal retroperitoneal paraganglioma;Anderson;Amer. Surg.,1974
5. Malignant, non-functional, non chromaffin paraganglioma of the retroperitoneum;Bassett;J. Natl. Med. Ass.,1973