Fernandez-Parra, R., Zilberstein, L., Fontaine, C., & Adami, C. (2017). Comparison of intratesticular lidocaine, sacrococcygeal epidural lidocaine and intravenous methadone in cats undergoing castration: a prospective, randomized, investigator-blind clinical trial. VETERINARY ANAESTHESIA AND ANALGESIA, 44(2), 356-363. https://doi.org/10.1016/j.vaa.2016.03.010