Orsi, R. de O., D. C. B. Barros, R. de C. M. Silva, J. V. de Queiroz, W. L. de P. Araújo, and A. J. Shinohara. “Toxic Metals in the Crude Propolis and Its Transfer Rate to the Ethanolic Extract”. Sociobiology, vol. 65, no. 4, Oct. 2018, pp. 640-4, doi:10.13102/sociobiology.v65i4.3379.