TY  - BOOK
AU  - Costa David G
TI  - Invitation to variational methods in differential equations
SN  - 9780817645359 (pbk)
U1  - B33, P7   TB 
PY  - 2007///
CY  - Boston
PB  - Birkhauser       
KW  -  Difference equations
KW  -  Differential equations
KW  -  Functional differential equations
KW  - Mathematics
N1  - Appendix 125-129p.; Bibliographical references 131-138p
ER  -