00308nam a22001097a 4500082002700000100001700027245004100044260004000085300002800125526003700153650000800190  a515.64bELScL-1, P-34  aElsgolc, L.E  aCalculus of variationscL.E, Elsgolc  aLondonbPergamon press  Ltd.c1962.  a178 P. :bill. ;c20 cm  a0b0c0d515_640000000000000_ELS  aMCE