@article{DAN_1964_159_6_a9,
     author = {E. S. Usachev},
     title = {On limit distributions in a stochastic learning model},
     journal = {Doklady Akademii Nauk},
     pages = {1238--1239},
     publisher = {mathdoc},
     volume = {159},
     number = {6},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_6_a9/}
}