Geodesic
Subdirect sums and differences for some classes of matrices
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 1, pp. 10-15

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The classes of accretive, dissipative, and accretive-dissipative matrices are shown to be closed with respect to taking a sub-direct sum, while the classes of $\mathrm{SQD}$ and $\mathrm{BG}$ matrices are closed with respect to taking a sub-direct difference. Computational consequences of these facts are discussed. 
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     author = {Kh. D. Ikramov},
     title = {Subdirect sums and differences for some classes of matrices},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2010_50_1_a1/}
}
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Kh. D. Ikramov. Subdirect sums and differences for some classes of matrices. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 1, pp. 10-15. http://geodesic.mathdoc.fr/item/ZVMMF_2010_50_1_a1/