00661nam0-22002411i-450-990001178140403321000117814FED01000117814(Aleph)000117814FED0100011781420000920d1970----km-y0itay50------baengHyperbolic equations and wavesRencontre.by FROISSART M.BerlinSpringer-Verlag1970Froissart,M.27141ITUNINARICAUNIMARCBK990001178140403321202-D-279976MA1MA1Hyperbolic equations and waves330569UNINAING01