Grotelueschen, Dale M., and Robert G. Mortimer. “Persistent Infections and Immunological Aspects of BVD Virus in Beef Cattle”. The Bovine Practitioner, no. 23 (November 1, 1988): 52–55. Accessed November 3, 2024. https://bovine-ojs-tamu.tdl.org/bovine/article/view/1420.