On a variant in the theory of characteristics for systems of first order partial differential equations
Matematički vesnik, Tome 19 (1967) no. 3, p. 329 .

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Classification : 35F50
@article{MV_1967_19_3_a20,
     author = {B. N. Rachajsky},
     title = {On a variant in the theory of characteristics for systems of first order partial differential  equations},
     journal = {Matemati\v{c}ki vesnik},
     pages = {329 },
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MV_1967_19_3_a20/}
}
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B. N. Rachajsky. On a variant in the theory of characteristics for systems of first order partial differential  equations. Matematički vesnik, Tome 19 (1967) no. 3, p. 329 . http://geodesic.mathdoc.fr/item/MV_1967_19_3_a20/