O. A. Zagryadskii, “Bertrand surfaces with a pseudo-Riemannian metric of revolution”, Moscow Univ. Math. Bull., 70, no. 1, 2015, 49
“3. Topological obstructions to analytic integrability of geodesic flows on manifolds which are not simply connected”, J Math Sci, 39, no. 3, 1987, 2739
A. T. Fomenko, A. Yu. Konyaev, “Geometry, dynamics and different types of orbits”, J. Fixed Point Theory Appl., 15, no. 1, 2014, 49
D. A. Fedoseev, “Bifurcation diagrams of natural Hamiltonian systems on Bertrand manifolds”, Moscow Univ. Math. Bull., 70, no. 1, 2015, 44
V. I. Arnol’d, S. P. Novikov, 16, Dynamical Systems VII, 1994, 303