@article{DAN_1970_190_2_a8,
     author = {M. A. Saifutdinov},
     title = {The existence of fundamental domains of a finitely generated {Klein} group},
     journal = {Doklady Akademii Nauk},
     pages = {283--284},
     publisher = {mathdoc},
     volume = {190},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_190_2_a8/}
}