@article{SF_1991__42_3_135080,
     author = {P. Agliano},
     title = {The one-block property in varieties of semigroups.},
     journal = {Semigroup forum},
     pages = {253--264},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     zbl = {0722.20038},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135080/}
}