Geodesic
About characteristic equation for two-parameter matrix equation
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2006), pp. 21-24

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In the work one characteristic function is defined for matrix, which allows to get comfortable form to study the characteristic equation for two-parameter matrix equation. 
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G. H. Sahakyan. About characteristic equation for two-parameter matrix equation. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2006), pp. 21-24. http://geodesic.mathdoc.fr/item/UZERU_2006_3_a1/