Choudhary, R., P. Singh, S. Gupta, P. P. Khosla, P. S. Matreja, and U. Singh. “A Comparative Study for Efficacy and Safety of Low Doses of Clonidine for Hemodynamic Stability in Patients Undergoing Laparoscopic Cholecystectomy”. International Journal of Basic & Clinical Pharmacology, vol. 8, no. 9, Aug. 2019, pp. 2102-7, doi:10.18203/2319-2003.ijbcp20194122.