Geodesic
The first boundary-value problem “in the large” for a quasi-linear equation of first order
Doklady Akademii Nauk, Tome 220 (1975) no. 2, pp. 300-303 
F. Hil'debrand. The first boundary-value problem “in the large” for a quasi-linear equation of first order. Doklady Akademii Nauk, Tome 220 (1975) no. 2, pp. 300-303. http://geodesic.mathdoc.fr/item/DAN_1975_220_2_a9/
@article{DAN_1975_220_2_a9,
     author = {F. Hil'debrand},
     title = {The first boundary-value problem {\textquotedblleft}in the large{\textquotedblright} for a quasi-linear equation of first order},
     journal = {Doklady Akademii Nauk},
     pages = {300--303},
     year = {1975},
     volume = {220},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_2_a9/}
}
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