@article{MZM_1971_10_2_a12,
     author = {B. E. Gopengauz},
     title = {A generalization of the {Schwarzian} derivative and its applications},
     journal = {Matemati\v{c}eskie zametki},
     pages = {229--238},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a12/}
}