1. Bernfeld, S. R., Hallam, T. G. and Lakshmikantham, V., Asymptotic equivalence of nonlinear differential equations in Banach spaces. To appear in SIAM Jour. for Analysis.
2. Bownds, J. M. and Diaz, J. B., Euler-Cauchy polygons and the local existence of solutions to abstract ordinary differential equations. Funkcialaj Ekvacioj, 15 (1972), 193–207.
3. Cellina, A., On the existence of solutions of ordinary differential equations in Banach spaces. Funkcialaj Ekvacioj, 14 (1971), 129–136.
4. ———, On local existence of solutions of ordinary differential equations. Bull. Acad. Pol. Sci., Sci. Math. Astr. Phys. 20 (1972).
5. Eisenfeld, J. and Lakshmikantham, V., On the existence of solutions of differential equations in a Banach space. To appear in Funkcialaj Ekvacioj.