А. Д. Брюно, “Нормализация системы Гамильтона вблизи инвариантного цикла или тора”, УМН, 44:2(266) (1989), 49–78 ; A. D. Bruno, “Normalization of a Hamiltonian system near an invariant cycle or torus”, Russian Math. Surveys, 44:2 (1989), 53–89
Е. И. Динабург, “Эффект Штарка для разностного оператора Шредингера”, ТМФ, 78:1 (1989), 70–80 ; E. I. Dinaburg, “Stark effect for a difference Schrödinger operator”, Theoret. and Math. Phys., 78:1 (1989), 50–57
William C. Tittemore, Jack Wisdom, “Tidal evolution of the Uranian satellites”, Icarus, 78:1 (1989), 63
Steven Weinberg, “Testing quantum mechanics”, Annals of Physics, 194:2 (1989), 336
Antonio Giorgilli, Amadeo Delshams, Ernest Fontich, Luigi Galgani, Carles Simó, “Effective stability for a Hamiltonian system near an elliptic equilibrium point, with an application to the restricted three body problem”, Journal of Differential Equations, 77:1 (1989), 167
H. Flashner, R.S. Guttalu, “Analysis of non-linear non-autonomous systems by truncated point mappings”, International Journal of Non-Linear Mechanics, 24:4 (1989), 327
R.S. Guttalu, H. Flashner, “Periodic solutions of non-linear autonomous systems by approximate point mappings”, Journal of Sound and Vibration, 129:2 (1989), 291
Andrea Milani, “Emerging stability and chaos”, Nature, 338:6212 (1989), 207
C. Maffei, P. Negrini, M. Scalia, “Bifurcation from 2-dimensional to 3-dimensional invariant tori”, Annali di Matematica pura ed applicata, 155:1 (1989), 117
Chjan C. Lim, “On singular Hamiltonians: the existence of quasi-periodic solutions and nonlinear stability”, Bull. Amer. Math. Soc., 20:1 (1989), 35