TY  - BOOK
AU  - Gelʹfand,I.M.
AU  - Fomin,S.V.
TI  - Calculus of variations
U1  - 517.4 
PY  - 1963///]
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - Mathematics 
KW  - Calculus of variations
N1  - Bibliography: p. 227
ER  -