1. The Hitchiker's Guide to the Galaxy;Adams,1979
2. A singular perturbation problem in needle crystals;Amick;Arch. Ration. Mech. Anal.,1990
3. Theory of Oscillators;Andronov,1966
4. Instability of dynamical systems with several degrees of freedom;Arnold;Sov. Math. Dokl.,1964
5. Ordinary Differential Equations;Arnold,1973