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"Sufficient conditions for the existence of nonnegative solutions of a ..."
George L. Karakostas, P. Ch. Tsamatos (2002)
- George L. Karakostas, P. Ch. Tsamatos:
Sufficient conditions for the existence of nonnegative solutions of a nonlocal boundary value problem. Appl. Math. Lett. 15(4): 401-407 (2002)

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