Geodesic
Systems with first order derivative in the “time”
Differencialʹnye uravneniâ, Tome 5 (1969) no. 1, pp. 174-185 
V. K. Romanko. Systems with first order derivative in the “time”. Differencialʹnye uravneniâ, Tome 5 (1969) no. 1, pp. 174-185. http://geodesic.mathdoc.fr/item/DE_1969_5_1_a13/
@article{DE_1969_5_1_a13,
     author = {V. K. Romanko},
     title = {Systems with first order derivative in the {\textquotedblleft}time{\textquotedblright}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {174--185},
     year = {1969},
     volume = {5},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_1_a13/}
}
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