[1]
“A First Order Analytical Elliptic Planar Model for 3/1 Resonance Problem”, RMxAA, vol. 14, no. 1, p. 641, Jan. 1987, Accessed: Dec. 09, 2025. [Online]. Available: https://astronomia.unam.mx/journals/rmxaa/article/view/1987rmxaa..14..641s