@article{EXMATH_1989_1989_1_a34,
     author = {Okrasinski, W.},
     title = {Nota sobre soluciones no triviales para ecuaciones de {Volterra} no lineales.},
     journal = {Extracta mathematicae},
     pages = {157-159},
     year = {1989},
     volume = {4},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1989_1989_1_a34/}
}