@article{CMUC_1975__16_3_a5,
     author = {Je\v{z}ek, Jaroslav and Kepka, Tom\'a\v{s}},
     title = {Semigroup representations of commutative idempotent {Abelian} groupoids},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {487--500},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1975},
     mrnumber = {0382484},
     zbl = {0313.20029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1975__16_3_a5/}
}