中国科学院数学与系统科学研究院期刊网
AMS
New Oscillation Criteria for Second Order Linear Matrix Differential Equations with Damping
Yan Cong XU, Ming De ZHU
Acta Mathematica Sinica . 2008, (6): 925 -936 .  DOI: 10.1007/s10114-007-6148-2