@article{DMGAA_2005_25_2_a4,
     author = {Chantasartrassmee, Avapa and Koppitz, J\"org},
     title = {Presolid varieties of n-semigroups},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {221--233},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2005_25_2_a4/}
}