@article{DAN_1969_188_3_a9,
     author = {V. I. Popov},
     title = {L. {S.~Pontrjagin's} maximum principle in the theory of univalent functions},
     journal = {Doklady Akademii Nauk},
     pages = {532--534},
     year = {1969},
     volume = {188},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_3_a9/}
}