@article{IVM_1961_3_a19,
     author = {N. N. Yanenko},
     title = {Invariant differential constraints for hyperbolic systems of quasi-linear equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {185--194},
     publisher = {mathdoc},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1961_3_a19/}
}