@article{FAA_1987_21_2_a11,
     author = {N. V. Ivanov},
     title = {Subgroups of {Teichm\"uller} modular groups and their {Frattini} subgroups},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {76--77},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_2_a11/}
}