S. Babapoor, “Protective Effect of In ovo Vaccination with IBV-Spike-Recombinant DNA and Chicken Interferon as an Adjuvant”, Int. J. Poult. Sci., vol. 8, no. 11, pp. 1034–1041, Oct. 2009, doi: 10.3923/ijps.2009.1034.1041.