@article{CMJ_2000_50_1_a11,
     author = {Fabrici, Imrich},
     title = {A note on principal ideals and $\Cal J$-classes in the direct product of two semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {91--98},
     year = {2000},
     volume = {50},
     number = {1},
     mrnumber = {1745463},
     zbl = {1038.20043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2000_50_1_a11/}
}