@article{DAN_1964_159_5_a6,
     author = {Yu. V. Egorov and A. A. Milyutin},
     title = {Sufficient conditions for a strong extremal in the class of curves with bounded derivative},
     journal = {Doklady Akademii Nauk},
     pages = {971--974},
     publisher = {mathdoc},
     volume = {159},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_5_a6/}
}