@article{SF_1993__47_2_135291,
     author = {K.D. jr. Magill},
     title = {A characterization of the arc by means of the {C-index} of itssemigroup.},
     journal = {Semigroup forum},
     pages = {396--398},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135291/}
}