1. Stability Theory of Differential Equations;Bellman,1953
2. Fonctions d'une Variable Réele;Bourbaki,1961
3. Ueber asymptotische Werthe, infinitäre Approximationen und infinitäre Auflösung von Gleichungen;du Bois-Reymond;Math. Ann.,1875
4. Some results concerning the behaviour at infinity of a real and continuous solution of an algebraic differential equation of the first order;Hardy,1912
5. Orders of Infinity;Hardy,1924