@article{DA_2002_9_4_a2,
     author = {A. Yu. Vasil'eva},
     title = {Strong distance invariance of perfect binary codes},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {33--40},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2002_9_4_a2/}
}