Kenneth G. Monks. 3x+1 Minus the +. Discrete Mathematics & Theoretical Computer Science, 5(1):47-54, 2002. [doi]
@article{Monks02, title = {3x+1 Minus the +}, author = {Kenneth G. Monks}, year = {2002}, url = {http://dmtcs.loria.fr/volumes/abstracts/dm050103.abs.html}, researchr = {https://researchr.org/publication/Monks02}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics & Theoretical Computer Science}, volume = {5}, number = {1}, pages = {47-54}, }