“Efficacy of a Modified-Live Virus Vaccine Administered to Calves With Maternal Antibodies and Challenged Seven Months Later With a Virulent Bovine Viral Diarrhea Type 2 Virus”. The Bovine Practitioner, vol. 43, no. 1, Dec. 2008, pp. 35-43, https://doi.org/10.21423/bovine-vol43no1p35-43.