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. Journal of Science and Technology CRRU, Chiangrai, Thailand, v. 5, n. 1, p. 64–76, 2026. Disponível em: https://li01.tci-thaijo.org/index.php/jstcrru/article/view/270633. Acesso em: 16 sep. 2026.