@article{AL_1999_38_3_a5,
     author = {N. S. Romanovskii},
     title = {On a {Freiheitssatz} for products of groups},
     journal = {Algebra i logika},
     pages = {354--367},
     year = {1999},
     volume = {38},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1999_38_3_a5/}
}