Khan, Mohammad Abu Wayed, et al. “Winterfield 2512 G-61 Strain of IBDV Vaccine (CEVAC® IBD L) Showed Reduced Pathogenicity in Commercial Chickens”. Microbes and Health, vol. 1, no. 2, Mar. 2013, pp. 58-61, doi:10.3329/mh.v1i2.14091.