Geodesic
An algorithm for testing the practical regularity of symmetric interval matrices
Sibirskij žurnal industrialʹnoj matematiki, Tome 7 (2004) no. 3, pp. 15-20

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The problem of check of a practical regularity of symmetric interval matrices is considered. In the work variant of the formula of Sherman–Morrison is suggested. This variant allowed to develop A. Bulgak's algorithm in view of specificity of symmetric interval matrices. 
@article{SJIM_2004_7_3_a2,
     author = {K. Aidyn},
     title = {An algorithm for testing the practical regularity of symmetric interval matrices},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2004_7_3_a2/}
}
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K. Aidyn. An algorithm for testing the practical regularity of symmetric interval matrices. Sibirskij žurnal industrialʹnoj matematiki, Tome 7 (2004) no. 3, pp. 15-20. http://geodesic.mathdoc.fr/item/SJIM_2004_7_3_a2/