@inproceedings{sorina2003approximation,
title={Approximation of infinite matrices by matricial Haar polynomials},
author={Sorina Barza, Victor Lie, and Nicolae Popa},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203614218650865},
booktitle={Arkiv for Matematik},
volume={43},
number={2},
pages={251-269},
year={2003},
}

Sorina Barza, Victor Lie, and Nicolae Popa. Approximation of infinite matrices by matricial Haar polynomials. 2003. Vol. 43. In Arkiv for Matematik. pp.251-269. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203614218650865.