@article{10_4064_ap_28_2_195_199,
     author = {Zofia Denkowska},
     title = {An example of a function which is locally constant in an open dense set, everywhere differentiable but not constant},
     journal = {Annales Polonici Mathematici},
     pages = {195--199},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1973},
     doi = {10.4064/ap-28-2-195-199},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-28-2-195-199/}
}