@article{TackeWiesenbergerLopezMrasetal.1992,
  author    = {Tacke, Reinhold and Wiesenberger, Frank and Lopez-Mras, Angel and Sperlich, J{\"o}rg and Mattern, G{\"u}nter},
  title     = {Neuartige zwitterionische λ5-Spirosilicate: Synthese und Kristallstruktur von Bis[1,2-benzoldiolato(2-)][2-(dimethylammonio)phenyl]silicat sowie Synthese von Bis[2,3-naphthalindiolato(2-)][2-(dimethylammonio)phenyl]silicat-Hemiacetonitril-Solvat},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-86916},
  year      = {1992},
  abstract  = {No abstract available.},
  subject      = {Silicate},
  language  = {de}
}
@article{SperlichBechtMuehleisenetal.1993,
  author    = {Sperlich, J{\"o}rg and Becht, Joachim and M{\"u}hleisen, Mathias and Wagner, Stephan A. and Mattern, G{\"u}nter and Tacke, Reinhold},
  title     = {Zwitterionische Bis[vic-arendiolato(2-)][(morpholinio)alkyl]silicate: Synthese sowie strukturelle Charakterisierung in L{\"o}sung und im Kristall},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-73153},
  year      = {1993},
  abstract  = {No abstract available.},
  subject      = {Silicate},
  language  = {de}
}
@article{Sponholz1994,
  author    = {Sponholz, Barbara},
  title     = {Silicate karst associated with lateritic formations (examples from eastern Niger)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-53852},
  year      = {1994},
  abstract  = {Silicate and iron crust karst pits and sinkholes in eastern Niger are filled with reworked lateritic sediments or with unconsolidated palaeosoils and aeolian deposits. The fillings facies depend on the environmental conditions during deposition. Geomorphological and sedimentological studies on the karst fillings and the interpretation of various karst/filling associations allow an approach to the chronology of landscape development in eastern Niger plateaus.},
  subject      = {Geographie},
  language  = {en}
}