nonlinear functional differential equations
It is proved that nonincreasing and satisfying the Volterra condition right-hand side of a functional differential equation does not guarantee the uniqueness of solutions.
 J. K. Hale: Theory of Functional Differential Equations
. Springer-Verlag, New York, 1977. MR 0508721
| Zbl 0352.34001
 S. Kato: On existence and uniqueness conditions for nonlinear ordinary differential equation in Banach space
. Funkcial. Ekvac. 19 (1976), 239-245. MR 0435538