@article{AUCMP_2006__47_1_a1,
     author = {Fla\v{s}ka, V\'aclav and Kepka, Tom\'a\v{s}},
     title = {Commutative zeropotent semigroups},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {3--14},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2006},
     mrnumber = {2509893},
     zbl = {1145.20321},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_2006__47_1_a1/}
}