1. Primary tumors of optic nerve;Hudson;Royal London Ophth. Hosp. Reports,1912
2. Primary intraneural tumors (gliomas) of optic nerve;Verhoeff;Sec. on Ophth., Amer. Med. Assoc.,1921
3. Primary tumor of optic nerve;Wyllie;Jour. of Neur. and Psychopath.,1924