@article{DAN_1973_212_3_a5,
     author = {L. A. Levin},
     title = {The concept of a random sequence},
     journal = {Doklady Akademii Nauk},
     pages = {548--550},
     publisher = {mathdoc},
     volume = {212},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_3_a5/}
}