@article{IM2_1992_38_3_a11,
     author = {M. V. Sapir},
     title = {The restricted {Burnside} problem for varieties of semigroups},
     journal = {Izvestiya. Mathematics },
     pages = {659--667},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1992_38_3_a11/}
}