@article{10_4064_fm_86_2_193_199,
     author = {J. Lipi\'nski},
     title = {On level sets of {Darboux} functions},
     journal = {Fundamenta Mathematicae},
     pages = {193--199},
     publisher = {mathdoc},
     volume = {86},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-86-2-193-199},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-86-2-193-199/}
}