@article{DeneckeWismath2009,
  author    = {Klaus-Dieter Denecke and Shelly Wismath},
  title     = {The dimension of a variety and the kernel of a hypersubstitution},
  doi       = {10.1142/S0218196709005342},
  url       = {http://www.worldscinet.com/ijac/},
  year      = {2009},
}