@article{AL_2010_49_6_a5,
     author = {N. S. Romanovskii},
     title = {Coproducts of rigid groups},
     journal = {Algebra i logika},
     pages = {803--818},
     year = {2010},
     volume = {49},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2010_49_6_a5/}
}