참고문헌
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피인용 문헌
- Nontrivial solutions for resonant difference systems via computations of the critical groups vol.385, pp.1, 2012, https://doi.org/10.1016/j.jmaa.2011.06.027
- Nontrivial solutions of a second order difference systems with multiple resonance vol.218, pp.18, 2012, https://doi.org/10.1016/j.amc.2012.03.017