1.
Kumar A, Ahmad B, Tyagi V. A comparative study of haemodynamic responses of butorphanol and fentanyl while surgeries. Int. J. of Health Sci. [Internet]. 2022 May 9 [cited 2024 Aug. 18];6(S1):9381-90. Available from: https://sciencescholar.us/journal/index.php/ijhs/article/view/7136