Geodesic
Simultaneous reduction to block
Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XX, Tome 346 (2007), pp. 49-62

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Analogs of some classical theorems on commuting matrices are proved. The new theorems deal with unitary congruences rather than unitary similarities; commutation is replaced by concommutation, defined in the paper, whereas normal and Hermitian matrices are replaced by conjugate-normal and symmetric matrices, respectively. 
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     author = {Kh. D. Ikramov and H. Fassbender},
     title = {Simultaneous reduction to block},
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     publisher = {mathdoc},
     volume = {346},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2007_346_a4/}
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Kh. D. Ikramov; H. Fassbender. Simultaneous reduction to block. Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XX, Tome 346 (2007), pp. 49-62. http://geodesic.mathdoc.fr/item/ZNSL_2007_346_a4/