@article{DAN_1997_354_4_a1,
     author = {N. P. Dolbilin and M. A. Shtan'ko and M. I. Shtogrin},
     title = {Nonbendability of the covering of a sphere by squares},
     journal = {Doklady Akademii Nauk},
     pages = {443--445},
     publisher = {mathdoc},
     volume = {354},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_4_a1/}
}