Общество с ограниченной ответственностью Издательско-торговая корпорация "Дашков и К". 2018. 411 с.
In this paper, we obtain necessary and sufficient conditions for the direct representability of one system of ordinary differential equations in the form of Lagrange–Ostrogradsky equations and construct the corresponding variational principle (the Hamilton–Ostrogradsky action). © 2025 Elsevier B.V., All rights reserved.