@article{SF_1993__47_2_135257,
     author = {R.P. Hunter},
     title = {On certain two generator monoids.},
     journal = {Semigroup forum},
     pages = {96--100},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0788.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135257/}
}