@article{MASLO_1975_25_2_a10,
     author = {Fabrici, Imrich},
     title = {Two-Sided {Bases} of {Semigroups}},
     journal = {Mathematica slovaca},
     pages = {173--178},
     year = {1975},
     volume = {25},
     number = {2},
     mrnumber = {0393298},
     zbl = {0306.20072},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1975_25_2_a10/}
}