M. I. de Camargo, N. Parizotto Junior, M. C. de Carvalho, and W. S. Marçal, “Mensuration of sialic acid seric level in nelore cattle exposed and nonexposed to bracken fern (Pteridium aquilinum)”, Semina: Ciênc. Agrár., vol. 29, no. 2, pp. 393–398, Aug. 2008.