Tasso J. Kaper, Stephen Wiggins, “Lobe area in adiabatic Hamiltonian systems”, Physica D: Nonlinear Phenomena, 51:1-3 (1991), 205
Chiping Chen, R.C.. Davidson, “Chaotic particle dynamics in free-electron lasers”, Phys. Rev. A, 43:10 (1991), 5541
Miroslav M. Novak, Fractals and Chaos, 1991, 225
Chjan C. Lim, “Binary trees, symplectic matrices and the Jacobi coordinates of celestial mechanics”, Arch. Rational Mech. Anal., 115:2 (1991), 153
Michiel Hazewinkel, Encyclopaedia of Mathematics, 1991, 375
Masayoshi Sekiguchi, Kiyotaka Tanikawa, NATO ASI Series, 272, Predictability, Stability, and Chaos in N-Body Dynamical Systems, 1991, 493
Shau-Jin Chang, “Quantum tunneling through Kolmogorov-Arnold-Moser curves”, Phys Rev A, 42:6 (1990), 3603
S Golin, S Marmi, Nonlinearity, 3:2 (1990), 507
Andrea Milani, Zoran Knežević, “Secular perturbation theory and computation of asteroid proper elements”, Celest Mech, 49:4 (1990), 347
М. В. Карасёв, “Новые глобальные асимптотики и аномалии в задаче квантования адиабатического инварианта”, Функц. анализ и его прил., 24:2 (1990), 24–36 ; M. V. Karasev, “New global asymptotics and anomalies for the problem of quantization of the adiabatic invariant”, Funct. Anal. Appl., 24:2 (1990), 104–114