1. Qualitative Theory of Second Order Dynamical Systems;Andronov,1973
2. Approximation of unbounded functions via compactification;Gingold;J. Approx. Theory,2004
3. Y. Gingold, H. Gingold, Geometrical properties of a family of compactifications, preprint, 2005
4. Stability of Motion;Hahn,1967
5. Differential Equations: Geometric Theory;Lefschetz,1977