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
Pseudorabies (PR), or Aujeszky's Disease is a disease caused by a Herpesvirus causing both apparent and inapparent infections in swine and causing disease in other species.
Hutchcroft, Tom and Beran, George
"Pseudorabies in Cattle,"
Iowa State University Veterinarian: Vol. 37
, Article 5.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol37/iss3/5