On the partitioned matrix $\begin{pmatrix}O&A\\A^\ast &Q\\ \end{pmatrix}$ and its associated system $AX=T,A^\ast Y+QX = Z$

Vladimiro Valerio
1981 RAIRO Analyse numérique  
doi:10.1051/m2an/1981150201771 fatcat:avsddvsbknadjm6y4ggkchhbru