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@article{10_4064_aa_56_1_33_53, author = {Jeffrey Lagarias}, title = {The set of rational cycles for the 3x+1 problem}, journal = {Acta Arithmetica}, pages = {33--53}, publisher = {mathdoc}, volume = {56}, number = {1}, year = {1990}, doi = {10.4064/aa-56-1-33-53}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-56-1-33-53/} }
Jeffrey Lagarias. The set of rational cycles for the 3x+1 problem. Acta Arithmetica, Tome 56 (1990) no. 1, pp. 33-53. doi : 10.4064/aa-56-1-33-53. http://geodesic.mathdoc.fr/articles/10.4064/aa-56-1-33-53/
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