@article{Gaschutz1982,
  author    = {{Wolfgang Gaschütz}},
  title     = {{Linear abgeschlossene Zahlenmengen I. [Linearly closed number sets I.]}},
  journal   = {{J. Reine Angew. Math.}},
  year      = {{1982}},
  volume    = {{330}},
  pages     = {{143--158}},
  note      = {{MR 83m:10095}},
}