@article{DAN_1970_194_1_a1,
     author = {K. I. Babenko},
     title = {Some questions in the theory of extremal problems of univalent functions of class~$S$},
     journal = {Doklady Akademii Nauk},
     pages = {12--15},
     publisher = {mathdoc},
     volume = {194},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_1_a1/}
}