T. V. Voltolini, F. A. P. Santos, J. C. Martinez, C. M. M. Bittar, H. Imaizumi, and C. S. Cortinhas, “DIFFERENT METABOLIZABLE PROTEIN LEVELS IN SUGAR CANE DIETS TO LACTATING DAIRY COWS”, Ciênc. anim. bras., vol. 9, no. 2, pp. 309–318, Jul. 2008.