Pure Natural Orifice Translumenal Endoscopic Surgery (NOTES) for ovariohysterectomy in bitches: a preliminary feasibility study - Machado-Silva, M. A. [UNESP]; Brun, M. V.; Voorwald, F. A. [UNESP]; Cardilli, D. J. [UNESP]; Toniollo, Gilson Hélio [UNESP] (Wiley-Blackwell, 2011)