by Fernández, Patricia Elena(National University of La Plata), Sanguinetti, Héctor Ramón(National University of La Plata ,National Service for Animal Health), Portiansky, Enrique Leo(National University of La Plata), Barbeito, Claudio Gustavo(National University of La Plata ,National University of La Plata), Gimeno, Eduardo Juan(National University of La Plata)
Published in Pesquisa Veterinária Brasileira (01.07.1999)