On the branching of a large periodic solution of a system of differential equations with a parameter

We study a normal periodic system of ordinary differential equations with a small parameter, which is quasilinear in a neighborhood of infinity, under the assumption that the right-hand side of the system has a critical linear approximation. In terms of the properties of the first homogeneous nonlinear approximation of the monodromy operator, we obtain conditions for the existence of a periodic solution whose initial value is infinitely large for an infinitesimal value of the parameter.