@article{KlarnerRado1973,
  author    = {{David A. Klarner and Richard Rado}},
  title     = {{Linear combinations of sets of consecutive integers}},
  journal   = {{American Math. Monthly}},
  year      = {{1973}},
  volume    = {{80}},
  number    = {{9}},
  pages     = {{985--989}},
  note      = {{MR  48 $\#$8378}},
}