@article{EXMATH_1989_1989_1_a32,
     author = {Okrasinski, W.},
     title = {Soluciones no triviales de ecuaciones de {Volterra} no lineales},
     journal = {Extracta mathematicae},
     pages = {151-153},
     year = {1989},
     volume = {4},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1989_1989_1_a32/}
}