Geodesic
Necessary optimality conditions for singular controls
Differencialʹnye uravneniâ, Tome 9 (1973) no. 3, pp. 568-573 
A. I. Kalinin. Necessary optimality conditions for singular controls. Differencialʹnye uravneniâ, Tome 9 (1973) no. 3, pp. 568-573. http://geodesic.mathdoc.fr/item/DE_1973_9_3_a25/
@article{DE_1973_9_3_a25,
     author = {A. I. Kalinin},
     title = {Necessary optimality conditions for singular controls},
     journal = {Differencialʹnye uravneni\^a},
     pages = {568--573},
     year = {1973},
     volume = {9},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_3_a25/}
}
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