@book{Wollert2007,
  author    = {Wollert, J{\"o}rg},
  title     = {Wireless-Technologies-Kongress 2007 : von der Technologie zur Anwendung ; [wireless technologies, 9. Kongress, 18. - 19. September 2007, Stuttgart] / Hrsg. J{\"o}rg F. Wollert},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  organization    = {Wireless-Technologies-Kongress <9, 2007, Stuttgart>},
  isbn      = {978-3-89838-084-3},
  pages     = {VIII, 308 S.},
  year      = {2007},
  language  = {de}
}
@book{Wollert2008,
  author    = {Wollert, J{\"o}rg},
  title     = {Wireless-Technologies-Kongress 2008 : von der Technologie zur Anwendung ; [wireless technologies, 10. Kongress, 23. - 24. September 2008, Bochum] / Hrsg. J{\"o}rg F. Wollert},
  publisher = {AKA},
  address   = {Heidelberg},
  organization    = {Wireless-Technologies-Kongress <10, 2008, Bochum>},
  isbn      = {978-3-89838-608-1},
  pages     = {IX, 351 S.},
  year      = {2008},
  language  = {de}
}