@article{ZaklanAbrellNeumann2016,
  author    = {Aleksandar Zaklan and Jan Abrell and Anne Neumann},
  title     = {Stationarity changes in long-run energy commodity prices},
  journal   = {Energy economics},
  volume    = {59},
  pages     = {96 -- 103},
  doi       = {10.1016/j.eneco.2016.07.022},
  year      = {2016},
}