Viscasillas, J., Everson, R., Mapletoft, E. K., & Dawson, C. (2019). Ultrasound-guided posterior extraconal block in the dog: anatomical study in cadavers. VETERINARY ANAESTHESIA AND ANALGESIA, 46(2), 246-250. https://doi.org/10.1016/j.vaa.2018.09.045