Geodesic
The group of units of a~free product of rings
Sbornik. Mathematics, Tome 62 (1989) no. 1, pp. 41-63

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The main theorem asserts that the multiplicative group of a free product of rings, all of which satisfy the condition $xy=1\Rightarrow yx=1$, with the amalgamated skew field $\Lambda$, is a free product of a certain family of its subgroups with an amalgamated subgroup $\Lambda\setminus\{0\}$. As an application a ring $R$ is indicated for which the group $\operatorname{GE}_n(R)$ is a nontrivial free factor of $\operatorname{GL}_n(R)$ ($n$ being any natural number greater than one). Bibliography: 12 titles. 
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     title = {The group of units of a~free product of rings},
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V. N. Gerasimov. The group of units of a~free product of rings. Sbornik. Mathematics, Tome 62 (1989) no. 1, pp. 41-63. http://geodesic.mathdoc.fr/item/SM_1989_62_1_a2/