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"Optimal existence conditions for second order periodic solutions of delay ..."
Daqing Jiang et al. (2004)
- Daqing Jiang, Wenjie Zuo, Donal O'Regan, Ravi P. Agarwal:

Optimal existence conditions for second order periodic solutions of delay differential equations with upper and lower solutions in the reverse order. Int. J. Comput. Math. 81(6): 707-717 (2004)

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