@article{IVM_1968_1_a9,
     author = {\`E. M. Kan},
     title = {The conservation laws for quasilinear systems of four partial differential equations of the first order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {78--80},
     publisher = {mathdoc},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_1_a9/}
}