S. M. Trapp, “Causes of death and reasons for euthanasia in a hospital population of dogs and cats”, Braz. J. Vet. Res. Anim. Sci., vol. 47, no. 5, pp. 395–402, Oct. 2010, doi: 10.11606/issn.1678-4456.bjvras.2010.26821.