@article{AM2_1979__19_136808,
     author = {M. Kwapisz and J. Turo},
     title = {On the existence and uniqueness of integrable solutions of functional equations in {Banach} space.},
     journal = {Aequationes mathematicae},
     pages = {53--65},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     zbl = {0426.45017},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136808/}
}