TY  - BOOK
AU  - Coddington, E. A. and Snoo, Hendrik S. V. de.
AU  - Snoo, Hendrik S. V. de ;jt. auth.
TI  - Regular boundary value problems associated with Paris of ordinary differential expressions
T2  - Lecture notes in Mathematics
U1  - 515.35 
PY  - 1981///
CY  - Berlin
PB  - Springer-Verlag
ER  -