@article{Koppitz2009,
  author    = {Koppitz, J{\"o}rg},
  title     = {All Reg-solid varieties of commutative semigroups},
  issn      = {0037-1912},
  doi       = {10.1007/s00233-008-9124-y},
  year      = {2009},
  abstract  = {We determine all regular solid varieties of commutative semigroups. Each of them is contained in the Reg- hyperequational class V (RC) defined by the associative law and the commutative law, and every subvariety of V (RC) is regular solid. In the present paper, the subvariety lattice of V (RC) will be characterized.},
  language  = {en}
}