01028nam0-22003491i-450 99000101361040332120190527133400.0000101361FED01000101361(Aleph)000101361FED0100010136120000920d1955----km-y0itay50------baengPlane waves and spherical meansapplied to partial differential equationsF. JohnNew York [etc.]Interscience1955viii, 172 p.23 cmInterscience tracts in pure and applied mathematics2Equazioni differenziali e integroDifferenziali517.37John,Fritz331219ITUNINARICAUNIMARCBK99000101361040332115-003529FI114-F-21925MA102 60 B 323758FINBNFINBNMA1FI1Plane waves and spherical means108203UNINAING01