@article{IM2_1969_3_4_a3,
     author = {D. I. Zaitsev},
     title = {Stably solvable groups},
     journal = {Izvestiya. Mathematics },
     pages = {723--736},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_4_a3/}
}