A., S., K. N., M. H. G., and S. L. “Comparative Study of Intrathecal Nalbuphine Versus Clonidine As Adjuvants to 0.5% Isobaric Levobupivacaine for Elective Infra Umbilical Surgeries”. Anaesthesia, Pain & Intensive Care, Vol. 23, no. 4, Apr. 2020, pp. 370-6, doi:10.35975/apic.v23i4.1169.