For citations:
Mukhin R.R. On the Poincar´e-Birkhoff theorem as the important result of the theory of dynamical systems. Chebyshevskii Sbornik. 2022;23(1):209-222. (In Russ.) https://doi.org/10.22405/2226-8383-2022-23-1-209-222
Mukhin R.R. On the Poincar´e-Birkhoff theorem as the important result of the theory of dynamical systems. Chebyshevskii Sbornik. 2022;23(1):209-222. (In Russ.) https://doi.org/10.22405/2226-8383-2022-23-1-209-222