On the partitioned matrix $\left(\begin{array}{cc}O& A\\ {A}^{*}& Q\end{array}\right)$ and its associated system $AX=T,{A}^{*}Y+QX=Z$
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 15 (1981) no. 2, p. 177-184
@article{M2AN_1981__15_2_177_0,
title = {On the partitioned matrix $\begin{pmatrix}O\&A\\A^\ast \&Q\end{pmatrix}$ and its associated system $AX=T, A^\ast Y+QX = Z$},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
publisher = {Dunod},
volume = {15},
number = {2},
year = {1981},
pages = {177-184},
zbl = {0458.15003},
mrnumber = {618822},
language = {en},
url = {http://www.numdam.org/item/M2AN_1981__15_2_177_0}
}

Valerio, Vladimiro. On the partitioned matrix $\begin{pmatrix}O&A\\A^\ast &Q\end{pmatrix}$ and its associated system $AX=T, A^\ast Y+QX = Z$. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 15 (1981) no. 2, pp. 177-184. http://www.numdam.org/item/M2AN_1981__15_2_177_0/

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