@article{ADM_2006_4_a4,
     author = {F. J. Pastijn and L. Oliveira},
     title = {Dense ideal extensions of strict regular semigroups},
     journal = {Algebra and discrete mathematics},
     pages = {67--80},
     publisher = {mathdoc},
     number = {4},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2006_4_a4/}
}