J. L. M. NEVES, P. S. G. MAGALHÃES, E. E. D. MORAES, and F. V. D. ARAÚJO, “TESTS OF INVISIBLE LOSSES AND CLEANING EFFICIENCY DETERMINATION IN MECHANICAL SUGAR CANE HARVESTING WITH AND WITHOUT TRASH”, Braz J Biosyst Eng, vol. 1, no. 2, pp. 93–102, Nov. 2007.