M. J. COLET, P. W. GARBUIO, H. C. DELALIBERA, C. B. SVERZUT, and J. B. D. ANDRADE, “IMPLEMENTING A CROP-LIVESTOCK INTEGRATION SYSTEM AND EVALUATION OF CORN SILAGE YIELD AS A FUNCTION OF SOIL MANAGEMENT”, Braz J Biosyst Eng, vol. 2, no. 1, pp. 31–36, Apr. 2008.