Geodesic
On the first variation in the theory of optimal control of systems with distributed parameters
Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2179-2181 
M. I. Sumin. On the first variation in the theory of optimal control of systems with distributed parameters. Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2179-2181. http://geodesic.mathdoc.fr/item/DE_1991_27_12_a26/
@article{DE_1991_27_12_a26,
     author = {M. I. Sumin},
     title = {On the first variation in the theory of optimal control of systems with distributed parameters},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2179--2181},
     year = {1991},
     volume = {27},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a26/}
}
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