On the partitioned matrix O A A * Q and its associated system A X = T , A * Y + Q X = Z
RAIRO. Analyse numérique, Tome 15 (1981) no. 2, pp. 177-184. 
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     author = {Valerio, Vladimiro},
     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 = {RAIRO. Analyse num\'erique},
     pages = {177--184},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {15},
     number = {2},
     year = {1981},
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Valerio, Vladimiro. On the partitioned matrix $\begin{pmatrix}O&A\\A^\ast &Q\end{pmatrix}$ and its associated system $AX=T, A^\ast Y+QX = Z$. RAIRO. Analyse numérique, Tome 15 (1981) no. 2, pp. 177-184. http://www.numdam.org/item/M2AN_1981__15_2_177_0/

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