中国科学院数学与系统科学研究院期刊网
The Estimates for Characteristic Numbers of Two Dimensional Linear Differential Equation with Almost Periodic Coefficients
Jin Lin SHI(1), Ji Yang CHEN(2
Acta Mathematica Sinica, Chinese Series . 2005, (3): 519 -526 .  DOI: 10.12386/A2005sxxb0062