@article{ZNSL_2002_285_a13,
     author = {I. O. Rasskazov},
     title = {The {Riemann} problem for the weakly perturbed $2\times2$ hyperbolic systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {194--206},
     publisher = {mathdoc},
     volume = {285},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_285_a13/}
}