@article{DAN_1970_194_3_a12,
     author = {N. Hadzhiivanov},
     title = {Extension of mappings into spheres and {P.} {S.} {Aleksandrov's} problem of bicompact compressions},
     journal = {Doklady Akademii Nauk},
     pages = {525--527},
     publisher = {mathdoc},
     volume = {194},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_3_a12/}
}