@ARTICLE{
author={Djordjevic Dragan S,Koliha JJ,Straskraba I},
year={2009},
title={Factorization of EP elements in C*-algebras},
journal={LINEAR & MULTILINEAR ALGEBRA},
volume={57},
number={6},
pages={587-594},
document_type={Article},
} 

@ARTICLE{
author={Koliha JJ,Rakocevic Vladimir R,Straskraba I},
year={2004},
title={The difference and sum of projectors},
journal={LINEAR ALGEBRA AND ITS APPLICATIONS},
volume={388},
number={},
pages={279-288},
document_type={Article},
}