@article{10_4064_ap_49_3_247_252,
     author = {Kazimierz Dankiewicz},
     title = {On approximate solutions of a functional equation in the class of differentiable functions},
     journal = {Annales Polonici Mathematici},
     pages = {247--252},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {1988},
     doi = {10.4064/ap-49-3-247-252},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-49-3-247-252/}
}