Picoli, T.; Peter, C. M. .; Hoffmann, J. F. .; Latosinski, G. S. .; Zani, J. L. .; Vargas, G. D.; Hubner, S.; Fischer, G. Chemical Characterization and Antibacterial Action of Brown Propolis Extract from Southern Brazil. Braz. J. Vet. Med. 2016, 38, 365-371.