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- [25] Existence of positive solutions of second-order periodic boundary value problems with sign-changing Green's function ACTA MATHEMATICAE APPLICATAE SINICA-ENGLISH SERIES, 2017, 33 (02): : 263 - 268
- [26] Existence of Positive, Negative, and Sign-Changing Solutions to Discrete Boundary Value Problems BOUNDARY VALUE PROBLEMS, 2011,