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The paper is concerned with the existence of solutions to an integrodifferential
problem arising in the neutron transport theory. By an anisotropic
singular perturbations method we show that solutions of such a problem exist
and are close to those of some nonlocal elliptic problem. The existence of the
solutions of the nonlocal elliptic problem with bounded data is ensured by the
Schauder fixed point theorem. Then an asymptotic method is applied in the
general case. The limits of the solutions of the nonlocal elliptic problems are
solutions of our integro-differential problem.