中国科学院数学与系统科学研究院期刊网
Essential Spectrum of p-Hyponormal Operators and Quasisimilarity
Ying Bin RUAN,Zi Kun YAN
Acta Mathematica Sinica, Chinese Series . 2000, (2): 343 -348 .  DOI: 10.12386/A2000sxxb0046