@article{IM2_1979_13_1_a7,
     author = {Yu. P. Razmyslov},
     title = {On a~problem of {Hall} and {Higman}},
     journal = {Izvestiya. Mathematics },
     pages = {133--146},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1979_13_1_a7/}
}