Thanommuang A, Pakdeeto J, Areerak K. DERIVATION OF A MATHEMATICAL MODEL OF THE DC HEAVY RAILWAY SYSTEM USING THE DQ METHOD. Suranaree J Sci Technol [internet]. 2026 Jun. 4 [cited 2026 Sep. 11];33(3):010422(1-10). available from: https://ph04.tci-thaijo.org/index.php/SUJST/article/view/10877