M. S. Pinto, J. E. de Faria, D. Message, S. T. A. Cassini, C. S. Pereira, and M. M. Gioso, “Effect of green propolis extracts on patogenic bacteria isolated from milk of cows with mastitis”, Braz. J. Vet. Res. Anim. Sci., vol. 38, no. 6, pp. 278–283, Jan. 2001, doi: 10.1590/S1413-95962001000600006.