Krüger, A. M., C. C. Jobim, I. Q. de Carvalho, and J. G. Moro. “A Simple Method for Determining Maize Silage Density on Farms”. Tropical Grasslands-Forrajes Tropicales, vol. 5, no. 2, May 2017, pp. 94-99, doi:10.17138/tgft(5)94-99.