@article{AM2_1985__29_137104,
     author = {Pavel Kostyrko},
     title = {On a local form of {Jensen's} functional equation. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {318--318},
     year = {1985},
     volume = {29},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137104/}
}