@book{Vollmer2017,
  author    = {Vollmer, Guy},
  title     = {Mobile app engineering},
  publisher = {dpunkt.verlag},
  address   = {Heidelberg},
  isbn      = {978-3-86490-421-9},
  pages     = {xxvii, 295},
  year      = {2017},
  language  = {de}
}
@book{Spitczok von BrisinskiVollmer2010,
  author    = {Spitczok von Brisinski, Niklas and Vollmer, Guy},
  title     = {Pragmatisches IT-Projektmanagement},
  publisher = {Dpunkt-Verlag},
  address   = {Heidelberg},
  isbn      = {978-3-89864-651-2},
  pages     = {XVI,265},
  year      = {2010},
  language  = {de}
}