K. O. da Silva, I. de A. Nääs, and S. G. de S. Campos, “Comparison of the use of traceability for swine in group or individually”, Braz. J. Vet. Res. Anim. Sci., vol. 41, no. 5, pp. 327–331, Oct. 2004, doi: 10.1590/S1413-95962004000500006.