@article{bwmeta1.element.bwnjournal-article-aav63i3p205bwm, author = {G\"unther Wirsching}, title = {An improved estimate concerning 3n+1 predecessor sets}, journal = {Acta Arithmetica}, volume = {64}, year = {1993}, pages = {205-210}, zbl = {0804.11022}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav63i3p205bwm} }
Günther Wirsching. An improved estimate concerning 3n+1 predecessor sets. Acta Arithmetica, Tome 64 (1993) pp. 205-210. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav63i3p205bwm/
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