Ultrasonic shears and bipolar vessel-sealing system for three-port laparoscopic ovariohysterectomy in dogs oleh N. Guizzo-Júnior, J.P.S. Feranti, M.C. Bairros, M. Bortoluzzi, A.C. Motta, L.W. Sartori, F.R. Santos, F.V. Tomazzoni, G. Brambatti, R.L. Guedes, M.A.M. Silva, M.V. Brun