@article{SF_1981__23_134523,
     author = {L. Satko and O. Grosek},
     title = {Smallest {A-ideals} in semigroups.},
     journal = {Semigroup forum},
     pages = {297--310},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0484.20030},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134523/}
}