Geodesic
Systems of two first order partial differential equations (local theory)
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1970), pp. 14-21.

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@article{IVM_1970_3_a2,
     author = {S. J. Bilchev},
     title = {Systems of two first order partial differential equations (local theory)},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {14--21},
     publisher = {mathdoc},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_3_a2/}
}
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%F IVM_1970_3_a2
S. J. Bilchev. Systems of two first order partial differential equations (local theory). Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1970), pp. 14-21. http://geodesic.mathdoc.fr/item/IVM_1970_3_a2/