@article{Klarner1988,
  author    = {{David A. Klarner}},
  title     = {{$m$-recognizability of sets closed under certain affine functions}},
  journal   = {{Discrete Applied Mathematics}},
  year      = {{1988}},
  volume    = {{21}},
  number    = {{3}},
  pages     = {{207--214}},
  note      = {{MR 90m:68075}},
}