E. Nielsen

The Justifications and Controversies of Panendoscopy – A Review

B. Levine, E. Nielsen, 1992, Ear, nose, & throat journal.

Aspergillosis of the Sphenoid Sinus Presenting as Orbital Pseudotumor

P. Savino, N. Schatz, R. Weisman, 1983, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.