Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
It is not uncommon to treat a chronic otitis externa that won't respond to the standard medical therapy. The purpose of this paper is to review the indications for the surgical correction of chronic otitis externa and also the surgical procedure.
Bruhn, Sherry R. and Grier, Ronald L.
"Surgical Treatment for Chronic Otitis Externa; Lateral Ear Resection,"
Iowa State University Veterinarian: Vol. 42
, Article 9.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol42/iss3/9