@article{AM2_1990__39_2-3_137344,
     author = {M. Baran},
     title = {On the graph of a quasi-additive function.},
     journal = {Aequationes mathematicae},
     pages = {129--133},
     year = {1990},
     volume = {39},
     number = {2-3},
     zbl = {0706.39007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1990__39_2-3_137344/}
}