%0 Journal Article
%A Lewis, Roger T.
%T The Oscillation of Fourth Order Linear Differential Operators
%J Canadian journal of mathematics
%D 1975
%P 138-145
%V 27
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-017-4/
%R 10.4153/CJM-1975-017-4
%F 10_4153_CJM_1975_017_4