D. R. S. Jakati, D. C. T.N., D. R. A., and D. S. Chandana M., “Comparison of the Effect of Intrathecal Morphine and Intrathecal Fentanyl as Adjuvants to 0.5% Levobupivacaine in Total Knee Replacement Surgery”, Adolescência e Saúde, pp. 163–174, Sep. 2026.