@article{MZM_1996_60_5_a12,
     author = {R. I. Grigorchuk},
     title = {On a~problem of day on nonelementary amenable groups in the class of finitely defined groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {774--775},
     publisher = {mathdoc},
     volume = {60},
     number = {5},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_5_a12/}
}