Stevens, E. T., M. S. Brown, W. W. Burdett, M. W. Bolton, S. T. Nordstrom, and C. C. L. Chase. “Efficacy of a Non-Adjuvanted, Modified-Live Virus Vaccine in Calves With Maternal Antibodies Against a Virulent Bovine Viral Diarrhea Virus Type 2a Challenge Seven Months Following Vaccination”. The Bovine Practitioner, vol. 45, no. 1, Dec. 2010, pp. 23-31, doi:10.21423/bovine-vol45no1p23-31.