@book{OPUS4-8334,
  title     = {Proceedings of the 9th Ph.D. retreat of the HPI Research School on service-oriented systems engineering},
  editor    = {Christoph Meinel and Hasso Plattner and J{\"u}rgen Roland Friedrich D{\"o}llner and Mathias Weske and Andreas Polze and Robert Hirschfeld and Felix Naumann and Holger Giese and Patrick Baudisch and Tobias Friedrich},
  number    = {100},
  isbn      = {978-3-86956-345-9},
  year      = {2015},
}