“Evaluation of efficacy of oral Tramadol as premedication in preventing post operative shivering after General Anesthesia - A Prospective Study”, J. Dhaka Natl. Med. Coll. Hosp., vol. 24, no. 2, pp. 6–9, Sep. 2018, doi: 10.3329/jdnmch.v24i2.80029.