Free subgroups of finitely-presented groups
Algebra i logika, Tome 16 (1977) no. 1, pp. 88-97.

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     author = {N. S. Romanovskii},
     title = {Free subgroups of finitely-presented groups},
     journal = {Algebra i logika},
     pages = {88--97},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1977_16_1_a6/}
}
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N. S. Romanovskii. Free subgroups of finitely-presented groups. Algebra i logika, Tome 16 (1977) no. 1, pp. 88-97. http://geodesic.mathdoc.fr/item/AL_1977_16_1_a6/