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2004 | ||
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1 | EE | 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) |
1 | Ravi P. Agarwal | [1] |
2 | Daqing Jiang | [1] |
3 | Donal O'Regan | [1] |