@article{Tietze2009,
  author    = {Tietze, J{\"u}rgen},
  title     = {Die Elastizit{\"a}t {\"o}konomischer Funktionen},
  series = {Das Wirtschaftsstudium : Wisu. 38 (2009), H. 8/9},
  journal   = {Das Wirtschaftsstudium : Wisu. 38 (2009), H. 8/9},
  publisher = {Lange},
  address   = {D{\"u}sseldorf},
  isbn      = {0340-3084},
  pages     = {1179 -- 1187},
  year      = {2009},
  language  = {de}
}
@article{Stulpe2009,
  author    = {Stulpe, Werner},
  title     = {Unitary Operator},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {807 -- 809},
  year      = {2009},
  language  = {en}
}
@article{Stulpe2009,
  author    = {Stulpe, Werner},
  title     = {Self-Adjoint Operator},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {692 -- 697},
  year      = {2009},
  language  = {en}
}
@article{Stulpe2009,
  author    = {Stulpe, Werner},
  title     = {Projection},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {497 -- 499},
  year      = {2009},
  language  = {en}
}
@article{Stulpe2009,
  author    = {Stulpe, Werner},
  title     = {Operator},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {440 -- 444},
  year      = {2009},
  language  = {en}
}
@article{StulpeScholz2009,
  author    = {Stulpe, Werner and Scholz, Erhard},
  title     = {Hilbert Space / Scholz, Erhard ; Stulpe, Werner},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {291 -- 295},
  year      = {2009},
  language  = {en}
}
@article{Stulpe2009,
  author    = {Stulpe, Werner},
  title     = {Density Operator},
  series = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  journal   = {Compendium of Quantum Physics : concepts, experiments, history and philosophy / Daniel Greenberger ... ed.},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-540-70622-9},
  pages     = {166 -- 169},
  year      = {2009},
  language  = {en}
}
@article{Wessling2009,
  author    = {Weßling, Matthias},
  title     = {Von Daniel D{\"u}sentrieb zu Dagobert Duck. Trinationale Master Class in High-Tech Entrepreneurship},
  series = {Dimensionen : Magazin der Fachhochschule Aachen (2009)},
  journal   = {Dimensionen : Magazin der Fachhochschule Aachen (2009)},
  pages     = {46},
  year      = {2009},
  language  = {de}
}
@article{BienerSasse2009,
  author    = {Biener, Ernst and Sasse, Torsten},
  title     = {Deponiebauprojekte gestern, heute und morgen : Ver{\"a}nderungen, Stand und Tendenzen aus der Sicht eines planenden Ingenieurb{\"u}ros / Sasse, Torsten ; Biener, Ernst},
  pages     = {1 -- 13},
  year      = {2009},
  language  = {de}
}
@article{Wessling2009,
  author    = {Weßling, Matthias},
  title     = {Como lidar com culturas estrangeiras: um treinamento inovador ao base da metodologia de "experiential learning" atrav{\´e}s Kolb \& Fry / Wessling, Matthias},
  series = {Revista Nic / Universidade Estadual de Londrina. 1 (2009), H. 2},
  journal   = {Revista Nic / Universidade Estadual de Londrina. 1 (2009), H. 2},
  isbn      = {1984-2325},
  year      = {2009},
  language  = {de}
}