Nedra Moalla . A CHARACTERIZATION OF SCHECHTER´S ESSENTIAL SPECTRUM BY MEAN OF MEASURE OF NON-STRICT-SINGULARITY#br# AND APPLICATION TO MATRIX OPERATOR[J]. Acta mathematica scientia, Series B, 2012 , 32(6) : 2329 -2340 . DOI: 10.1016/S0252-9602(12)60183-0

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