Comparison of ketamine and S(+)-ketamine, with romifidine and diazepam, for total intravenous anesthesia in horses - Rossetti, Renata Bello; Cortopassi, Silvia Renata Gaido; Intelizano, Tatiana Regina; Machado, Thaís Sodré de Lima; Cruz, Rodrigo Silvério Ferreira da (Veterinary Anaethesia and Analgesia, 2008)