@article{AM2_1994__47_2-3_137571,
     author = {Roland Girgensohn},
     title = {Nowhere differentiable solutions of a system of functional equations.},
     journal = {Aequationes mathematicae},
     pages = {89--99},
     publisher = {mathdoc},
     volume = {47},
     number = {2-3},
     year = {1994},
     zbl = {0791.26005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1994__47_2-3_137571/}
}