@article{WittigGuinkoHahnHadjalietal.2009,
  author    = {R{\"u}diger Wittig and Sita Guinko and Karen Hahn-Hadjali and Brice Sinsin and Georg Zizka and Stefan Dressler and Adjima Thiombiano},
  title     = {Twenty Years of Cooperation between Botanists of the Goethe-University Frankfurt (Germany) and of West African Universities},
  journal   = {Flora et Vegetatio Sudano-Sambesica},
  volume    = {12},
  pages     = {5 -- 21},
  year      = {2009},
}