TY  - BOOK
AU  - Troutman, John L
TI  - Variational calculus with elementary convexity
T2  - Undergraduate texts in mathematics
SN  - 0387907718
U1  - 515.64 
PY  - 1983///
CY  - New York
PB  - Springer-Verlag
KW  - Calculus of variations
ER  -