@article{MZM_1997_61_3_a1,
     author = {V. I. Buslaev and S. F. Buslaeva},
     title = {Compositions of linear-fractional transformations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {332--338},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_3_a1/}
}