@article{DAN_1957_115_6_a0,
     author = {Yu. E. Alenitsyn},
     title = {On functions having no values in common and the outer boundary of the function's domain},
     journal = {Doklady Akademii Nauk},
     pages = {1055--1057},
     publisher = {mathdoc},
     volume = {115},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_6_a0/}
}