TY  - DATA
AU  - Zettl, Anton.
TI  - Sturm-Liouville theory 
T2  - Mathematical Surveys and Monographs, 
SN  - 9781470413484 (online)
PY  - 2005///
CY  - Providence, R.I.
PB  - American Mathematical Society
KW  - Sturm-Liouville equation
N1  - Includes bibliographical references (p. 303-326) and index
UR  - https://doi.org/http://dx.doi.org/10.1090/surv/121
ER  -