On the partitioned matrix $\begin{pmatrix}O&A\\A^\ast &Q\\ \end{pmatrix}$ and its associated system $AX=T,A^\ast Y+QX = Z$
RAIRO. Anal. numér., 15 2 (1981) 177-184
Published online: 31 January 2017
DOI: 10.1051/m2an/1981150201771