TY  - JOUR
AU  - Willett, D.
TI  - Oscillation on Finite or Infinite Intervals of Second Order Linear Differential Equations(1)
JO  - Canadian mathematical bulletin
PY  - 1971
SP  - 539
EP  - 550
VL  - 14
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-096-8/
DO  - 10.4153/CMB-1971-096-8
ID  - 10_4153_CMB_1971_096_8
ER  -