@article{SM_1999_190_8_a2,
     author = {D. V. Osin},
     title = {On the growth of rank for subgroups of finitely generated groups},
     journal = {Sbornik. Mathematics},
     pages = {1151--1172},
     publisher = {mathdoc},
     volume = {190},
     number = {8},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_8_a2/}
}