Vannucchi, C.I., Santos, S.E.C. dos and Visintin, J.A. 1999. In vitro viability of canine spermatozoa frozen in tris-fructose-citric acid extender with ethylene glycol. Brazilian Journal of Veterinary Research and Animal Science. 36, 4 (Jan. 1999), 205-211. DOI:https://doi.org/10.1590/S1413-95961999000400007.