@ARTICLE{
author={Cvetkovic-Ilic Dragana S,Hai Guojun,Chen Alatancang},
year={2015},
title={Some results on Fredholmness and boundedness below of an upper triangular operator matrix},
journal={JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS},
volume={425},
number={2},
pages={1071-1082},
document_type={Article},
}