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
Much remains unknown as to the complete etiology of urinary calculi. Calculi are not a disease but a symptom. Sound therapeutics must be based upon an accurate diagnosis of the etiological agent.
Maddy, K. T.
"The Etiology Of Urinary Calculi,"
Iowa State University Veterinarian: Vol. 7
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol7/iss3/7