Geodesic
On necessary conditions for high order optimality for singular controls of discrete systems
Differencialʹnye uravneniâ, Tome 8 (1972) no. 10, pp. 1857-1867 
L. Ashchepkov. On necessary conditions for high order optimality for singular controls of discrete systems. Differencialʹnye uravneniâ, Tome 8 (1972) no. 10, pp. 1857-1867. http://geodesic.mathdoc.fr/item/DE_1972_8_10_a15/
@article{DE_1972_8_10_a15,
     author = {L. Ashchepkov},
     title = {On necessary conditions for high order optimality for singular controls of discrete systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1857--1867},
     year = {1972},
     volume = {8},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_10_a15/}
}
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