MathSciNet bibliographic data MR654462 (84h:06019) 06F20 (16A54 22D25 46L40) Handelman, David Free rank $n+1$$n+1$ dense subgroups of ${\bf R}\sp{n}$${\bf R}\sp{n}$ and their endomorphisms. J. Funct. Anal. 46 (1982), no. 1, 1–27. Article

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