@article{JIS_2016__19_8_a2,
     author = {Neto,  Ant\^onio Francisco},
     title = {A note on a theorem of {Schumacher}},
     journal = {Journal of integer sequences},
     year = {2016},
     volume = {19},
     number = {8},
     zbl = {1353.11039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2016__19_8_a2/}
}