. . . . "106015978"^^ . . "105660537"@en-us . "the calculus of maxima and minima of definite integrals"@en-us . "0"^^ . . "0"^^ . "06015978-n"^^ . "calculus of variations"@en-us . . . "104606024"@en-us . "calculus of variations"^^ . .