С. Л. Зиглин, “Расщепление сепаратрис и несуществование первых интегралов в системах дифференциальных уравнений типа гамильтоновых с двумя степенями свободы”, Изв. АН СССР. Сер. матем., 51:5 (1987), 1088–1103 ; S. L. Ziglin, “Splitting of the separatrices and the nonexistence of first integrals in systems of differential equations of Hamiltonian type with two degrees of freedom”, Math. USSR-Izv., 31:2 (1988), 407–421
Jarmo Hietarinta, “Direct methods for the search of the second invariant”, Physics Reports, 147:2 (1987), 87
Emil Horozov, “On the non-integrability of Gross-Neveu models”, Annals of Physics, 174:2 (1987), 430
Tassos Bountis, V. Papageorgiou, M. Bier, “On the singularity analysis of intersecting separatrices in near-integrable dynamical systems”, Physica D: Nonlinear Phenomena, 24:1-3 (1987), 292
Jair Koiller, J.M. Balthazar, T. Yokoyama, “Relaxation-chaos phenomena in celestial mechanics”, Physica D: Nonlinear Phenomena, 26:1-3 (1987), 85
Haruo Yoshida, “A criterion for the non-existence of an additional integral in Hamiltonian systems with a homogeneous potential”, Physica D: Nonlinear Phenomena, 29:1-2 (1987), 128
Hidekazu Ito, “A criterion for non-integrability of Hamiltonian systems with nonhomogeneous potentials”, Z. angew. Math. Phys., 38:3 (1987), 459
T. C. Bountis, V. Papageorgiou, P. Winternitz, “On the integrability of systems of nonlinear ordinary differential equations with superposition principles”, J Math Phys (N Y ), 27:5 (1986), 1215
А. Т. Фоменко, “Топология поверхностей постоянной энергии интегрируемых гамильтоновых систем и препятствия к интегрируемости”, Изв. АН СССР. Сер. матем., 50:6 (1986), 1276–1307 ; A. T. Fomenko, “The topology of surfaces of constant energy in integrable Hamiltonian systems, and obstructions to integrability”, Math. USSR-Izv., 29:3 (1987), 629–658
В. В. Козлов, “Расщепление сепаратис и рождение изолированных периодических решений в гамильтоновых системах с полутора степенями свободы”, УМН, 41:5(251) (1986), 177–178 ; V. V. Kozlov, “The splitting of separatrices and the generation of isolated periodic solutions in Hamiltonian systems with one-and-a-half degrees of freedom”, Russian Math. Surveys, 41:5 (1986), 149–150