TY  - JOUR
AU  - Ahlbrandt, Calvin D.
AU  - Hinton, Don B.
AU  - Lewis, Roger T.
TI  - Necessary and Sufficient Conditions for the Discreteness of the Spectrum of Certain Singular Differential Operators
JO  - Canadian journal of mathematics
PY  - 1981
SP  - 229
EP  - 246
VL  - 33
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-019-1/
DO  - 10.4153/CJM-1981-019-1
ID  - 10_4153_CJM_1981_019_1
ER  -