TY  - BOOK
TI  - Boundary value problems and symplectic algebra for ordinary differential and quasi-differential operators 
SN  - 0821810804 | 9781470412883 (online)
PY  - 1999///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/surv/061 | http://dx.doi.org/10.1090/surv/061
ER  -