Jawad Zahir, Muhammad Shafiq, Muhammad Salman Maqbool, Muhammad Nadeem Khan. “Nitrous Oxide in Oxygen and Air in Oxygen for Perioperative Analgesia : A Comparative Study”. Journal of Rawalpindi Medical College 12, no. 2 (December 30, 2008). Accessed January 2, 2026. http://www.journalrmc.com/index.php/JRMC/article/view/748.