@article{AM2_1993__46_2-3_137557,
     author = {Roland Girgensohn},
     title = {Functional equations and nowhere differentiable functions.},
     journal = {Aequationes mathematicae},
     pages = {243--256},
     publisher = {mathdoc},
     volume = {46},
     number = {2-3},
     year = {1993},
     zbl = {0788.26007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137557/}
}