1. Some remarks on the existence and uniqueness of solutions of hyperbolic equation ∂2z∂x∂y = ƒ (x, y, z, ∂z∂x, ∂z∂y);Alexiewicz;Studia Math.,1956
2. Generic properties of differential equations;Costello;SIAM J. Math. Anal.,1973
3. Sur la convergence des approximations successives pour les contractions non linéaires dans un espace de Banach;De Blasi;C. R. Acad. Sci. Paris Sér. A,1976
4. Generic properties of hyperbolic partial differential equations;De Blasi;J. London Math. Soc. (2),1977
5. Generic properties of differential equations in Banach space;De Blasi;Bull. Acad. Polon. Sci. Sér. Math. Astronom. Phys.,1978