@article{FredebeulKreinVogel2007,
  author    = {Markus Fredebeul-Krein and Erika Vogel},
  title     = {Underground Storage Facilities in the German natural gas market: A need for access regulation to ensure competition?},
  journal   = {Zeitschrift f{\"u}r Energiewirtschaft. 30 (2006), H. 4},
  pages     = {257 -- 270},
  year      = {2007},
}