@article{MS2_1981__48_166737,
     author = {Gustaf Gripenberg},
     title = {Unique solutions of some {Voltera} integral equations.},
     journal = {Mathematica Scandinavica},
     pages = {59--67},
     year = {1981},
     volume = {48},
     zbl = {0463.45002},
     url = {http://geodesic.mathdoc.fr/item/MS2_1981__48_166737/}
}