@book{HackLindemann2007,
  author    = {Hack, Stefan and Lindemann, Markus},
  title     = {Enterprise SOA einf{\"u}hren},
  publisher = {Galileo Pr.},
  address   = {Bonn},
  isbn      = {978-3-89842-858-3},
  pages     = {443 S. : Ill., graph. Darst.},
  year      = {2007},
  language  = {de}
}
@book{HackLindemann2008,
  author    = {Hack, Stefan and Lindemann, Markus},
  title     = {Enterprise SOA Roadmap},
  publisher = {Galileo Pr.},
  address   = {Bonn},
  isbn      = {1-59229-162-7},
  pages     = {417 S. : Ill., graph. Darst.},
  year      = {2008},
  language  = {en}
}