K. Salomo, A. P. Dantas, C. M. Borba, L. C. Campos, D. G. Machado, F. R. Aquino Neto and S. L. De Castro, “Chemical Composition and Microbicidal Activity of Extracts from Brazilian and Bulgarian Propolis,” Letters of Applied Microbiology, Vol. 38, No. 2, 2004, pp. 87-92.doi10.1111/j.1472-765X.2003.01458.x - References - Scientific Research Publishing