TY  - BOOK
AU  - Coddington,E.A & De Snoo,H.S.V
ED  - De Snoo, H.S.V
TI  - Regular boundary value problems associated with pairs of ordinary differential expressions
T2  - Lecture notes in mathematics 858
SN  - 35401070611
U1  - 10.01+22 
PY  - 1981///
CY  - Berlin
PB  - Springer
ER  -