@book{BochmannRitz2013,
  author    = {Bochmann, Sandra and Ritz, Thomas},
  title     = {Prototyping tools for mobile applications},
  publisher = {Steinbeis-Ed.},
  address   = {Stuttgart},
  isbn      = {978-3-943356-45-8},
  pages     = {234 S. : Ill., graph. Darst.},
  year      = {2013},
  language  = {en}
}
@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}
}