TY - JOUR AU - W. Okrasinski TI - Nontrivial solutions to nonlinear Volterra equations JO - Extracta Mathematicae PY - 1989 SP - 151 VL - 4 IS - 3 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/item/EXMATH_1989__4_3_38335/ LA - en ID - EXMATH_1989__4_3_38335 ER -