For citations:

Levenshtam V.B. Averaging of a normal system of ordinary differential equations of high frequency with a multipoint boundary value problem on a semi-axis. Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika. 2024;(3):64-69. (In Russ.) https://doi.org/10.26907/0021-3446-2024-3-64-69