@article{PickKorte2017,
  author    = {Leonie Pick and Monika Korte},
  title     = {An annual proxy for the geomagnetic signal of magnetospheric currents on Earth based on observatory data from 1900-2010},
  journal   = {Geophysical Journal International},
  volume    = {211},
  number    = {2},
  pages     = {1223 -- 1236},
  doi       = {10.1093/gji/ggx367},
  year      = {2017},
}