Geodesic
The Cauchy problem for a system of differential equations with two unknown functions of two arguments
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2001), pp. 48-56 
T. V. Chekmarev. The Cauchy problem for a system of differential equations with two unknown functions of two arguments. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2001), pp. 48-56. http://geodesic.mathdoc.fr/item/IVM_2001_7_a6/
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     title = {The {Cauchy} problem for a~system of differential equations with two unknown functions of two arguments},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Chekmarev T. V., “Svedénie zadachi Koshi dlya sistemy dvukh differentsialnykh uravnenii v chastnykh proizvodnykh s dvumya neizvestnymi funktsiyami k sisteme integralnykh uravnenii”, Izv. vuzov. Matematika, 1959, no. 5, 197–207

[2] Chekmarev T. V., “Reshenie giperbolicheskoi sistemy dvukh differentsialnykh uravnenii v chastnykh proizvodnykh s dvumya neizvestnymi funktsiyami”, Izv. vuzov. Matematika, 1959, no. 6, 220–228 | Zbl

[3] Chekmarev T. V., “Zadachi Koshi, Gursa i Koshi–Gursa dlya vyrozhdayuschikhsya sistem uravnenii, II”, Izv. vuzov. Matematika, 1970, no. 1, 98–107 | Zbl