@ARTICLE{
author={Ljubisavljevic Jelena,Cvetkovic-Ilic Dragana S},
year={2013},
title={Representations for Drazin inverse of block matrix},
journal={JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS},
volume={15},
number={3},
pages={481-497},
document_type={Article},
} 

@ARTICLE{
author={Cvetkovic Dragana S,Ljubisavljevic Jelena},
year={2012},
title={A Note on the Drazin Inverse of a Modified Matrix},
journal={ACTA MATHEMATICA SCIENTIA},
volume={32},
number={2},
pages={483-487},
document_type={Article},
} 

@ARTICLE{
author={Ljubisavljevic Jelena,Cvetkovic-Ilic Dragana S},
year={2011},
title={Additive results for the Drazin inverse of block matrices and applications},
journal={JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS},
volume={235},
number={12},
pages={3683-3690},
document_type={Article},
}