Geodesic
A strong optimality condition for singular controls in a Goursat–Darboux system
Differencialʹnye uravneniâ, Tome 16 (1980) no. 6, pp. 1054-1059 
L. T. Ashchepkov; O. V. Vasiliev; I. L. Kovalenok. A strong optimality condition for singular controls in a Goursat–Darboux system. Differencialʹnye uravneniâ, Tome 16 (1980) no. 6, pp. 1054-1059. http://geodesic.mathdoc.fr/item/DE_1980_16_6_a7/
@article{DE_1980_16_6_a7,
     author = {L. T. Ashchepkov and O. V. Vasiliev and I. L. Kovalenok},
     title = {A strong optimality condition for singular controls in a {Goursat{\textendash}Darboux} system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1054--1059},
     year = {1980},
     volume = {16},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_6_a7/}
}
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