TY  - DATA
AU  -  Levitan, I.S. Sargsjan
TI  - Sturm—Liouville and Dirac Operators
SN  - 9789401137485
PY  - 1991///
PB  - Springer Netherlands
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/978-94-011-3748-5
ER  -