@article{10_4064_cm125_1_3,
     author = {Gerald Kuba},
     title = {On the differentiability of certain
 saltus functions},
     journal = {Colloquium Mathematicum},
     pages = {15--30},
     publisher = {mathdoc},
     volume = {125},
     number = {1},
     year = {2011},
     doi = {10.4064/cm125-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm125-1-3/}
}