Brunker, Don; Higgs, Denis Constructions of \(\Sigma\)-groups, relatively free \(\Sigma\)-groups. (English) Zbl 0702.22003 J. Aust. Math. Soc., Ser. A 46, No. 1, 8-21 (1989). Reviewer: N.J.Rothman MSC: 22A05 20K45 54A20 40A05 54H10 PDF BibTeX XML Cite \textit{D. Brunker} and \textit{D. Higgs}, J. Aust. Math. Soc., Ser. A 46, No. 1, 8--21 (1989; Zbl 0702.22003)
Galambos, Janos The ergodic properties of the denominators in the Oppenheim expansion of real numbers into infinite series of rationals. (English) Zbl 0198.38104 Q. J. Math., Oxf. II. Ser. 21, 177-191 (1970). MSC: 11K55 PDF BibTeX XML Cite \textit{J. Galambos}, Q. J. Math., Oxf. II. Ser. 21, 177--191 (1970; Zbl 0198.38104) Full Text: DOI