I. N. de Barros, S. O. de S. Silva, S. A. Tanikawi, and P. E. Brandão, “Molecular stability of a vaccine strain of Canine coronavirus after serial passages in A72 cells”, Braz. J. Vet. Res. Anim. Sci., vol. 54, no. 1, pp. 48-53, May 2017.