@article{ZNSL_2001_276_a7,
     author = {V. V. Zhuk and G. I. Natanson},
     title = {Semi-norms and continuity modules of functions defined on a~segment},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {155--203},
     publisher = {mathdoc},
     volume = {276},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2001_276_a7/}
}