นันทสำเริง น. . (2011) “Application of Center of Risk Gravity in the Location Analysis for a Siting of Emergency Medical Service Vehicles”, Journal of Engineering, RMUTT, 2, pp. 21–29. Available at: https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242133 (Accessed: 20 May 2024).