@article{Salzmann2006,
  author    = {Ulrich Salzmann},
  title     = {Pollenanalytical studies in NE-Nigeria: preliminary results from the Manga Grasslands and Lake Tilla, Biu Plateau},
  journal   = {Berichte des Sonderforschungsbereichs 268},
  volume    = {8},
  pages     = {321 -- 333},
  year      = {2006},
}