@article{RM_1970_25_5_a3,
     author = {A. A. Milyutin},
     title = {General schemes of necessary conditions for extrema and problems of optimal control},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {109--115},
     publisher = {mathdoc},
     volume = {25},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_5_a3/}
}