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
A 5 year old Holstein cow was entered into the clinic with a history of loss of condition for approximately 4 weeks. She gave birth to twins 10 days previous to the date of admission to the clinic. Both calves were healthy and doing fine. No pronounced symptoms of traumatic pericarditis had been exhibited until 1 or 2 days prior to entrance to the clinic.
Krichel, Joseph R.
"Surgical Correction of a Case of Traumatic Pericarditis,"
Iowa State University Veterinarian: Vol. 19
, Article 10.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol19/iss1/10