Hutem A, Suwanwong S. Small Radial of Stable Circular Orbit Perturbations and Effective Potential of a Charged Particle in a Central Force Field: f(r)=-k/r^2 - Eo/r^4 Using Polar Coordinates. J. Sci. Technol. CRRU [internet]. 2026 Jun. 29 [cited 2026 Sep. 12];5(1):64-76. available from: https://li01.tci-thaijo.org/index.php/jstcrru/article/view/270633