00285nam a2200097Ia 4500008004100000082002000041100001600061245005300077260003000130300002700160250404b        |||||||| |||| 00| 0 eng d  a515.64bP266.IC  aPars, L. A.  aAn introduction to the calculus of variationsb/  aLondon:bHeinemann,c1962  axi, 350p. Index. Bibl.