@article{Bogisch1996,
  author    = {Bogisch, Heinz},
  title     = {Bodenchemie in Sekundarstufe II : Thema Kationenaustausch ; Grundlagen und Experimente},
  year      = {1996},
  language  = {de}
}
@article{Bogisch1996,
  author    = {Bogisch, Heinz},
  title     = {Bodenchemie in Sekundarstufe II : Thema Kationenaustauschkapazit{\"a}t eines Bodens ; Grundlagen und Experimente},
  year      = {1996},
  language  = {de}
}