@article{AL_1993_32_4_a4,
     author = {N. S. Romanovskii and V. Yu. Boluts},
     title = {Normal automorphisms of free $2$-step solvable},
     journal = {Algebra i logika},
     pages = {441--449},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1993_32_4_a4/}
}