@techreport{BlandfordDachwaldDigeletal.2015,
  author    = {Blandford, Daniel and Dachwald, Bernd and Digel, Ilya and Espe, Clemens and Feldmann, Marco and Francke, Gero and Hiecke, Hannah and Kowalski, Julia and Lindner, Peter and Plescher, Engelbert and Sch{\"o}ngarth, Sarah},
  title     = {Enceladus Explorer : Schlussbericht — Version: 1.0},
  publisher = {FH Aachen},
  address   = {Aachen},
  doi       = {10.2314/GBV:86319950X},
  year      = {2015},
  language  = {de}
}
@book{BenkoePlescher2013,
  author    = {Benk{\"o}, Marietta and Plescher, Engelbert},
  title     = {Space law: reconsidering the definition/delimitation question and the passage of spacecraft through foreign airspace. (Essential air and space law ; 12)},
  publisher = {Eleven International Publishing},
  address   = {The Hague},
  isbn      = {9789462360761 ; 9462360766 ; 9789460948176},
  pages     = {VII, 159 S.},
  year      = {2013},
  language  = {en}
}