A~certain invariant of the Cauchy and Goursat systems
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1975), pp. 93-103.

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     author = {V. R. Fridlender and M. Z. Khusnetdinov},
     title = {A~certain invariant of the {Cauchy} and {Goursat} systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {93--103},
     publisher = {mathdoc},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_2_a10/}
}
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V. R. Fridlender; M. Z. Khusnetdinov. A~certain invariant of the Cauchy and Goursat systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1975), pp. 93-103. http://geodesic.mathdoc.fr/item/IVM_1975_2_a10/