TY JOUR TI On the influence of unilateral bonds on the stability and oscillations of elastic rings KW stability KW ring KW variational problem KW bifurcation points KW onesided constraints KW oscillation JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Andryukova, V.Y. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"