@article{Bontrup2017,
  author    = {Heinz-Josef Bontrup},
  title     = {Die Probleme des Demografieproblems},
  journal   = {Gegenblende. Das gewerkschaftliche Debattenmagazin},
  number    = {30},
  pages     = {9 -- 14},
  year      = {2017},
}