@article{DA_1990_30_a6,
     author = {A. I. Serdyukov},
     title = {Extremal problems on permutations for special classes of matrices},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {57--60},
     year = {1990},
     number = {30},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1990_30_a6/}
}