00770nam0-22002531i-450-99000124727040332120161020104354.0000124727FED01000124727(Aleph)000124727FED0100012472720001205d1983----km-y0itay50------baengExterior differential systems and the calculus of variationsPhillip A. GriffithsBoston [etc.]Birkhauser1983VIII, 335 p.24 cmGriffiths,Phillip A.<1938- >ITUNINARICAUNIMARCBK990001247270403321C-3-(2521157MA1MA1Exterior differential systems and the calculus of variations381651UNINA00980nam--2200349---450-99000235548020331620090513115829.0000235548USA01000235548(ALEPH)000235548USA0100023554820050113h----1977km-y0itay0103----baeng||||||||001yyCall to the nationsextracts from the writings of Shoghi Effendi[S.l.]Baha'icopyr. 1977XVIII, 69 p.20 cm20012001001-------2001Bahaismo297.89SHOGHI <effendi>571451ITsalbcISBD990002355480203316II.2. 5123 (ISP III 369)22590 E.C.ISP III00207570BKECOSIAV51020050113USA011107RSIAV49020090513USA011158Call to the nations1062455UNISA