Elementary equivalence of unitary linear groups over rings
E. S. Balmasov, E. I. Bunina

References
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2.	Golubchik I. Z., Mikhalëv A. V., “Izomorfizmy unitarnykh grupp nad assotsiativnymi koltsami”, Zap. nauch. sem. LOMI, 132, Nauka, L., 1983, 97–109
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5.	Feis K., Algebra: koltsa, moduli i kategorii, Mir, M., 1977
6.	Beidar C. I., Mikhalev A. V., “On Mal'cev's theorem on elementary equivalence of linear groups”, Contemp. Math., 131:1 (1992), 29–35