1.
Sánchez L. A Note on Nontrivial Peniodic Solutions of Dynamical Systems with Subquadratic Potential. Rev. mat. complut. [Internet]. 1994 Jan. 1 [cited 2026 Jul. 30];7(1):179. Available from: https://revistas.ucm.es/index.php/REMA/article/view/REMA9494120179A