Arshad, Maria, Liaqat Ali, Aaifa Khalid, Muhammad Nauman Ahmad, and Arshad Taqi. 2019. “A Randomized Controlled Trial to Compare the Efficacy of Pethidine and Tramadol for Postoperative Shivering”. Anaesthesia, Pain & Intensive Care 21 (4), 427-31. https://mail.apicareonline.com/index.php/APIC/article/view/87.