Kahrs, R. F., B. E. Sheffey, and R. D. Schultz. “Infectious Bovine Rhinotracheitis (IBR) Virus in Bovine Semen: Current Concepts”. The Bovine Practitioner, vol. 1977, no. 12, Nov. 1977, pp. 82-84, doi:10.21423/bovine-vol1977no12p82-84.