TY - JOUR AU - I. O. Rasskazov TI - The Riemann problem for the weakly perturbed $2\times2$ hyperbolic systems JO - Zapiski Nauchnykh Seminarov POMI PY - 2002 SP - 194 EP - 206 VL - 285 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_2002_285_a13/ LA - ru ID - ZNSL_2002_285_a13 ER -