@article{AL_1995_34_2_a5,
     author = {U. U. Umirbaev},
     title = {The occurrence problem for free solvable groups},
     journal = {Algebra i logika},
     pages = {211--232},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1995_34_2_a5/}
}