@article{IM2_1988_30_2_a5,
     author = {M. V. Sapir},
     title = {Problems of {Burnside} type and the finite basis property in varieties of semigroups},
     journal = {Izvestiya. Mathematics },
     pages = {295--314},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1988_30_2_a5/}
}