00310nam a2200097Ia 4500008004100000082002000041100002200061245007500083260002800158300002600186250404b        |||||||| |||| 00| 0 eng d  a515.64bW424.CV  aWeinstoch, Robert  aCalculus of variations with applications to physics and engineeringb/  aNew York:bDover,c1974  ax, 326p. Index. Bibl.