MathSciNet bibliographic data MR1363412 (97g:06020) 06F15 (20E05) Bennett, Curtis D. Explicit free subgroups of ${\rm Aut}({\bf R},\leq)$${\rm Aut}({\bf R},\leq)$. Proc. Amer. Math. Soc. 125 (1997), no. 5, 1305–1308. Article

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