@article{DAN_1978_238_3_a4,
     author = {Yu. I. Merzlyakov},
     title = {Matrix representations of free groups},
     journal = {Doklady Akademii Nauk},
     pages = {527--530},
     publisher = {mathdoc},
     volume = {238},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_238_3_a4/}
}