00876nam0-22003131i-450-99000103579040332120081028124242.0000103579FED01000103579(Aleph)000103579FED0100010357920001205d1966----km-y0itay50------baengGBy-------001yyVariational principlesB.L. MoiseiwitschLondon [etc.]Interscience1966Interscience monographs and texts in physics and astronomy20Fisica matematicaFisica teorica530Moiseiwitsch,Benjamin Lawrence41414ITUNINARICAUNIMARCBK99000103579040332120-042F4962FI1FI1Variational principles192243UNINA