中国科学院数学与系统科学研究院期刊网
AMS
On the Estimation of Solutions for Some Linear Systems of Differential Equations
L. R. Awad, E. M. El-Kholy, Sh. El-Bendary
Acta Mathematica Sinica . 1998, (1): 41 -46 .  DOI: 10.1007/BF02563882