@article{HaertnagelSchaalSchmidt1989,
  author    = {H{\"a}rtnagel, R. and Schaal, W. and Schmidt, Th.},
  title     = {Erdgasspeicherung in Xanten. Anlage zur unterirdischen Speicherung von Erdgas in Kavernen.},
  series = {Bergbau},
  volume    = {40},
  journal   = {Bergbau},
  number    = {8},
  pages     = {392 -- 397},
  year      = {1989},
  language  = {de}
}