@article{Salzmann2006,
  author    = {Ulrich Salzmann},
  title     = {Between desert and forest: the Holocene savannas of NE-Nigeria},
  journal   = {Berichte des Sonderforschungsbereichs 268},
  volume    = {14},
  pages     = {21 -- 30},
  year      = {2006},
}