TY  - BOOK
AU  - Gelfand, I M
AU  - Fomin, S V
TI  - Calculus of variations
SN  - 9780486414485
PB  - Dover Publications
KW  - Calculus  Variations
KW  - Euler equations  Canonical form
KW  - Mathematics
KW  - Variational problems
N1  - Reprint year 2000, includes bibliographical references and index
ER  -