%0 Journal Article
%A Willett, D.
%T Generalized de la Vallée Poussin Disconjugacy Tests for Linear Differential Equations(1)
%J Canadian mathematical bulletin
%D 1971
%P 419-428
%V 14
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-073-3/
%R 10.4153/CMB-1971-073-3
%F 10_4153_CMB_1971_073_3