TY  - BOOK
AU  - Coddington E A
AU  - Snoo H S V de
TI  - Reguloar boundary value problems associated with pairs of ordinary differential expressions
U1  - 515.352 
PY  - 1981///
CY  - Berlin
PB  - Springer Verlag
KW  - Boundary value problems
KW  - Ordinary differential equations
ER  -