中国科学院数学与系统科学研究院期刊网
ON THE UPWARD STABILITY OF MAXIMAL CHARACTERISTIC EXPONENT AND LOWARD STABILITY OF MINIMAL CHARACTERISTIC EXPONENT
张学铭
Acta Mathematica Sinica, Chinese Series . 1958, (3): 324 -332 .  DOI: 10.12386/A1958sxxb0029