กาสังข์ ว. (2013) “APPLICATION OF THE ROOT-LOCUS METHOD FOR MODEL REFERENCE DC. SERVO SYSTEM IDENTIFICATION AND COMPENSATION DE SIGN”, Engineering and Applied Science Research, 9(3), pp. 49–60. available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/8342 (accessed: 31 August 2026).