@article{SF_1982__25_134581,
     author = {A. Nagy},
     title = {Semigroups whose proper two-sided ideals are power joined.},
     journal = {Semigroup forum},
     pages = {325--330},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0498.20047},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134581/}
}