H. A. do Amaral and M. H. M. A. Larsson, “Study of the variation in the serum concentrations of phenobarbital in dogs exposured to a long term treatment”, Braz. J. Vet. Res. Anim. Sci., vol. 43, no. 4, pp. 435–441, Aug. 2006, doi: 10.11606/issn.1678-4456.bjvras.2006.26457.