@article{NSJOM_1993_23_2a_8,
     author = {Chmieli\'nski Jacek},
     title = {Set-valued isometries on the real line},
     journal = {Novi Sad Journal of Mathematics},
     pages = {101-111},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1993_23_2a_8/}
}