«Effects of Castration on Epidural Administration of Lidocaine-Tramadol in West African Dwarf (Wad) Goats». (2019) Nigerian Journal of Physiological Sciences, 34(2), с. 141–147. доступний у: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/463 (дата звернення: 8 Липень 2026).