中国科学院数学与系统科学研究院期刊网
ON THE EQUIVALENCE PROBLEM OF DIFFERENTIAL EQUATIONS AND DIFFERENCE-DIFFERENTIAL EQUATIONS IN THE THEORY OF STABILITY OF THE FIRST CRITICAL CASE
王联
Acta Mathematica Sinica, Chinese Series . 1960, (1): 104 -124 .  DOI: 10.12386/A1960sxxb0009