Bounded solutions of families of systems of differential equations and their approximation

In the paper, we consider the problem of finding a bounded solution of a one-parametric family of systems of ordinary differential equations. Using the parametrization method, we prove necessary and sufficient conditions for the existence of a unique solution of the problem considered that is bounded on the whole axis in terms of a two-sided infinite block-band matrix composed with respect to integrals over intervals of length $h>0$ the matrix of the system of differential equations. Also, we construct a family of two-point boundary-value problems on a finite interval that approximate the problem of finding the bounded solution and finds an interconnection between the correct solvability of the initial and approximating problems.