@article{JIS_2009__12_1_a6,
     author = {Johnson,  Inga and Powers,  Sean and Starr,  Colin and Trevelyan,  Charles and Webster,  Craig},
     title = {Characterizing {Frobenius} semigroups by filtration},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {1},
     zbl = {1197.11018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_1_a6/}
}