@article{10_21136_CPM_1978_117970,
     author = {Bla\v{z}ek, Jaroslav and Bor\'ak, Emil and Mal\'y, Jan},
     title = {On {K\"opcke} and {Pompeiu} functions},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {53--61},
     publisher = {mathdoc},
     volume = {103},
     number = {1},
     year = {1978},
     doi = {10.21136/CPM.1978.117970},
     mrnumber = {0486352},
     zbl = {0376.26006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1978.117970/}
}