TY  - JOUR
AU  - Lewis, Roger T.
TI  - The Oscillation of Fourth Order Linear Differential Operators
JO  - Canadian journal of mathematics
PY  - 1975
SP  - 138
EP  - 145
VL  - 27
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-017-4/
DO  - 10.4153/CJM-1975-017-4
ID  - 10_4153_CJM_1975_017_4
ER  -