Cremonesi F, Torti E, Pecile A, Groppetti D, Biondi P
Department of Veterinary Clinical Science, Section of Veterinary Clinical Obstetric and Gynecology, Faculty of Veterinary Medicine, University of Milan, 20133 Milano, Italy.
Vet Res Commun. 2003 Sep;27 Suppl 1:587-9. doi: 10.1023/b:verc.0000014223.69962.93.