@article{DAN_1991_318_3_a0,
     author = {S. V. Bochkarev},
     title = {Rearrangements of multiplicative systems},
     journal = {Doklady Akademii Nauk},
     pages = {521--523},
     publisher = {mathdoc},
     volume = {318},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_3_a0/}
}