Diéguez, F. J., M. Cerviño, and E. Yus. “Bovine Viral Diarrhea Virus (BVDV) Genetic Diversity in Spain: A Review”. Spanish Journal of Agricultural Research, Vol. 15, no. 2, July 2017, p. e05R01, doi:10.5424/sjar/2017152-10619.