Geodesic
The method of Cauchy characteristics and generalized solutions of the Hamilton–Jacobi–Bellman equation
Doklady Akademii Nauk, Tome 320 (1991) no. 3, pp. 556-561 
N. N. Subbotina. The method of Cauchy characteristics and generalized solutions of the Hamilton–Jacobi–Bellman equation. Doklady Akademii Nauk, Tome 320 (1991) no. 3, pp. 556-561. http://geodesic.mathdoc.fr/item/DAN_1991_320_3_a9/
@article{DAN_1991_320_3_a9,
     author = {N. N. Subbotina},
     title = {The method of {Cauchy} characteristics and generalized solutions of the {Hamilton{\textendash}Jacobi{\textendash}Bellman} equation},
     journal = {Doklady Akademii Nauk},
     pages = {556--561},
     year = {1991},
     volume = {320},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_3_a9/}
}
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