@article{DMTCS_2002_5_a3,
     author = {Monks, Kenneth G.},
     title = {3x+1 {Minus} the +},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {5},
     year = {2002},
     doi = {10.46298/dmtcs.297},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.297/}
}