%0 Journal Article
%A Qigui Yang
%T Interval oscillation criteria for second order
  self-adjoint matrix differential systems with damping
%J Annales Polonici Mathematici
%D 2002
%P 185-198
%V 79
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap79-2-8/
%R 10.4064/ap79-2-8
%G en
%F 10_4064_ap79_2_8