Pal, T., C. Biswas, and S. Bhar Kundu. “Comparison of Efficacy of Butorphanol and Nalbuphine As Premedicant in Patients Undergoing Elective Craniotomy Using Propofol and Desflurane Anesthesia – A Randomized Clinical Study”. Asian Journal of Medical Sciences, vol. 13, no. 7, July 2022, pp. 43-48, doi:10.3126/ajms.v13i7.42973.