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
Imagine that you are a recently graduated veterinarian working for a mixed animal practice which serves a moderately populated area. One of your more regular clients presents to you a cockatiel which was purchased six months ago. The owner describes a two week history of dysphagia, anorexia, loss of weight and a general loss of activity. Upon physical examination the most outstanding lesions consisted of white, moderately raised areas of well circumscribed nodules and fibronecrotic plaques in the oral cavity.
Ruhl, Frederick; Graham, D. L.; and Zenoble, R. D.
"Oral Lesions in Passerine and Psittacine Birds: A Differential Diagnosis,"
Iowa State University Veterinarian: Vol. 44
, Article 6.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol44/iss1/6