Geodesic
Geometry of the Lagrange variational problem with a double integral in $X_4$
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1964), pp. 153-165 
D. E. Chernyi. Geometry of the Lagrange variational problem with a double integral in $X_4$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1964), pp. 153-165. http://geodesic.mathdoc.fr/item/IVM_1964_1_a20/
@article{IVM_1964_1_a20,
     author = {D. E. Chernyi},
     title = {Geometry of the {Lagrange} variational problem with a double integral in $X_4$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {153--165},
     year = {1964},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1964_1_a20/}
}
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