By Christoph Schubart   Peter Koller   in Journal of Natural History

ISSN:1464-5262|39|6|469-481

Taylor & Francis Ltd‎(2005)‎

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By Hettich Peter   Koller Jannick   in European Procurement and Public Private Partnership Law Review (EPPPL)

ISSN:2194-7376|10|4|320-325

Lexxion Verlagsgesellschaft mbH‎(2015)‎

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