Li Weiguo, Li Hongjie, "A min-max theorem and its applications to nonconservative systems", International Journal of Mathematics and Mathematical Sciences, vol. 2003, Article ID 683815, 10 pages, 2003. https://doi.org/10.1155/S0161171203108010
A min-max theorem and its applications to nonconservative systems
A nonvariational generation of a min-max principle by A. Lazer is made. And it is used to prove a new existence results for a nonconservative systems of ordinary differential equations with resonance.
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