@article{VSGU_2009_6_a2,
     author = {G. V. Voskresenskaya},
     title = {Sets of modular forms which define  groups},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {21--34},
     publisher = {mathdoc},
     number = {6},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2009_6_a2/}
}