TY  - BOOK
AU  - Coddington,Earl A.
AU  - Snoo,Hendrik S.
TI  - Regular boundary value problems associated with pairs of ordinary differential expressions
PY  - 1981///
CY  - Berlin
PB  - Springer-Verlag
KW  - Boundary value problems
KW  - Differential operators
KW  - Eigenfuction expansions
N1  - Bibliography: p. 220-223; Includes index
ER  -