TY - JOUR AU - Chantasartrassmee, Avapa AU - Koppitz, Jörg TI - Presolid varieties of n-semigroups JO - Discussiones Mathematicae. General Algebra and Applications PY - 2005 SP - 221 EP - 233 VL - 25 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DMGAA_2005_25_2_a4/ LA - en ID - DMGAA_2005_25_2_a4 ER -