[1]
W. S. Marçal, I. de O. Buture, M. C. de Carvalho, M. S. Fortes, and R. de A. e Silva, “Levels of lead and cadmium in mineral supplements for cattle commercialized in Londrina”, Semina: Ciênc. Agrár., vol. 25, no. 4, pp. 359–364, May 2004.