@article{PIM_2001_N_S_70_84_a0,
     author = {Smile Markovski and Ana Sokolova and Lidija Goracinova Ilieva},
     title = {On {Semigroups} {Defined} by the {Identity} xxy = y},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {1 },
     publisher = {mathdoc},
     volume = {_N_S_70},
     number = {84},
     year = {2001},
     zbl = {1036.20051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2001_N_S_70_84_a0/}
}