R. V. Monteiro, M. R. C. dos Santos, E. B. Vianna, T. C. S. de Araújo, C. E. Verona, and L. P. L. Fedullo, “Serial clinical, colpo-cytological and endocrinological evaluations of Cerdocyon thous bitches from the Rio de Janeiro zoo”, Braz. J. Vet. Res. Anim. Sci., vol. 39, no. 2, pp. 93–96, Jan. 2002, doi: 10.1590/S1413-95962002000200007.