Bryant, R MKovacs, LStohr, Ralph2015-12-130033-5606http://hdl.handle.net/1885/94124Let L denote the free Lie ring of rank 2r with free generators x i, yi (1 ≤ i ≤ r), and let τ be the automorphism of L that interchanges xi and yi for all i. We construct a ℤ-basis of L that consists of pairs of elements which are interchanged by �Invariant bases for Free Lie Rings200210.1093/qjmath/53.1.12015-12-12