Geodesic
Graph centers used for stabilization of matrix factorizations
Discussiones Mathematicae. Graph Theory, Tome 30 (2010) no. 2, pp. 249-259

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Systems of consistent linear equations with symmetric positive semidefinite matrices arise naturally while solving many scientific and engineering problems. In case of a "floating" static structure, the boundary conditions are not sufficient to prevent its rigid body motions.
Keywords: FETI, parallel computing, generalised inverse, graph center 
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     author = {Kabel{\'\i}kov\'a, Pavla},
     title = {Graph centers used for stabilization of matrix factorizations},
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Kabelíková, Pavla. Graph centers used for stabilization of matrix factorizations. Discussiones Mathematicae. Graph Theory, Tome 30 (2010) no. 2, pp. 249-259. http://geodesic.mathdoc.fr/item/DMGT_2010_30_2_a5/