@article{DAN_1977_237_3_a3,
     author = {G. A. Kurina},
     title = {On a degenerate optimal control problem and singular perturbations},
     journal = {Doklady Akademii Nauk},
     pages = {517--520},
     publisher = {mathdoc},
     volume = {237},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_3_a3/}
}