00728nam0-22002651i-450-990001280710403321000128071FED01000128071(Aleph)000128071FED0100012807120000920d1971----km-y0itay50------baengSpectra of Partial Differential OperatorsBy Schechter MartinAmsterdam [etc.]North-Holland1971NorthSchechter,Martin13643ITUNINARICAUNIMARCBK99000128071040332126-I-1412086MA1MA1Spectra of Partial Differential Operators118448UNINAING01