Ferreira, L. das N. et al. 2012. Effect of the ethanolic extract from green propolis on production of antibodies after immunization against canine parvovirus (CPV) and canine coronavirus (CCoV). Brazilian Journal of Veterinary Research and Animal Science. 49, 2 (Apr. 2012), 116–121. DOI:https://doi.org/10.11606/issn.2318-3659.v49i2p116-121.