1. Ordinary Differential Equations;Hale,1969
2. Qualitative Theory of Differential Equations;Nemytskii,1972
3. Equazioni differenziali non lineari;Sansone,1956
4. Prolongations and stability in dynamical systems;Auslander;Ann. Inst. Fourier (Grenoble),1964
5. Prolongations and stability in dynamical systems;Auslander;Ann. Inst. Fourier (Grenoble),1964