TY  - RPRT
TI  - Note on the Sturm-Liouville Eigenvalue-Eigenfunction Problem with Singular End-Points.
AU  - E C Kemble
PY  - 1933
DO  - 10.1073/pnas.19.7.710
UR  - https://pubmed.ncbi.nlm.nih.gov/16577552/
ID  - 16577552
ER  -