TY  - BOOK
AU  - Gelʹfand,I.M.
AU  - Fomin,S.V.
AU  - Silverman,Richard A.
TI  - Calculus of variations
SN  - 0486414485 (pbk.)
U1  - 515.64 
PY  - 2000///
CY  - Mineola, NY
PB  - Dover Publications
KW  - Calculus of variations
N1  - Originally published: Englewood Cliffs, NJ : Prentice-Hall, 1963
ER  -