%0 Journal Article %A W. Okrasinski %T Nonlinear Volterra equations and physical applications. [Appendix: On an extension of Gripenberg's condition]. %J Extracta Mathematicae %D 1989 %P 51 %V 4 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/EXMATH_1989__4_2_38295/ %G en %F EXMATH_1989__4_2_38295