00611nam0-22002291i-450-990001307290403321000130729FED01000130729(Aleph)000130729FED0100013072920000920d--------km-y0itay50------baengInvariant variational principlesby LOGAN J.D.Logan,John David48876ITUNINARICAUNIMARCBK990001307290403321C-26-(13820305MA1MA1Invariant variational principles339402UNINAING01