MathSciNet bibliographic data MR551509 10A99 Böhm, Corrado; Sontacchi, Giovanna On the existence of cycles of given length in integer sequences like \$x\sb{n+1}=x\sb{n}/2\$$x\sb{n+1}=x\sb{n}/2$ if \$x\sb{n}\$$x\sb{n}$ even, and \$x\sb{n+1}=3x\sb{n}+1\$$x\sb{n+1}=3x\sb{n}+1$ otherwise. Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8) 64 (1978), no. 3, 260–264. Links to the journal or article are not yet available

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