TY  - GEN
AU  - Bernfeld,Stephen R.
AU  - Lakshmikantham,V.
TI  - An introduction to nonlinear boundary value problems
SN  - 0120931508
AV  - QA379 
U1  - 515/.35 
PY  - 1974///
CY  - New York
PB  - Academic Press
KW  - Nonlinear boundary value problems
KW  - Nonlinear theories
ER  -