TY  - JOUR
AU  - Beesack, Paul R.
TI  - Elementary Proofs of the Extremal Properties of the Eigenvalues of the Sturm-Liouville Equation
JO  - Canadian mathematical bulletin
PY  - 1960
SP  - 59
EP  - 77
VL  - 3
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1960-010-3/
DO  - 10.4153/CMB-1960-010-3
ID  - 10_4153_CMB_1960_010_3
ER  -