by Fan, H.-Y., Zhang, L., Chu, E.K.-w., Wei, Y.
Published in Linear algebra and its applications (15.02.2016)

by Chu, E.K.-W., Fan, H.-Y., Lin, W.-W.
Published in Linear algebra and its applications (01.02.2005)

by CHU, E. K.-W., Lin, W.-W., Wang, C.-S.
Published in The ANZIAM journal (01.07.2008)

by Kautsky, J., Nichols, N.K., Chu, E.K.-W.
Published in Linear algebra and its applications (01.08.1989)