Sharma, A.K. et al. 2021. Haemodynamic Study Following Epidural Administration of Tramadol and Butorphanol in Combination of Lignocaine Hydrochloride in Goats. International Journal of Livestock Research. 11, 12 (Dec. 2021), 61–65. DOI:https://doi.org/10.5455/ijlr.20201229065628 .