Copyright © 2011 Guotao Wang et al. This is an open access article distributed under the
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This paper investigates the existence of the extremal solutions to the integral boundary
value problem for first-order impulsive functional integrodifferential equations with deviating
arguments under the assumption of existing upper and lower solutions in the reversed order.
The sufficient conditions for the existence of solutions were obtained by establishing several new
comparison principles and using the monotone iterative technique. At last, a concrete example
is presented and solved to illustrate the obtained results.