TY  - JOUR
AU  - Qigui Yang
TI  - Interval oscillation criteria for second order
  self-adjoint matrix differential systems with damping
JO  - Annales Polonici Mathematici
PY  - 2002
SP  - 185
EP  - 198
VL  - 79
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap79-2-8/
DO  - 10.4064/ap79-2-8
LA  - en
ID  - 10_4064_ap79_2_8
ER  -