TY - JOUR AU - Z. Kowalski TI - A difference method for certain hyperbolic systems of non-linear partial differential equations of the first order JO - Annales Polonici Mathematici PY - 1967 SP - 313 EP - 322 VL - 19 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-19-3-313-322/ DO - 10.4064/ap-19-3-313-322 LA - en ID - 10_4064_ap_19_3_313_322 ER -