@article{KerkaKriegesmannSchweringetal.2007,
  author    = {Kerka, Friedrich and Kriegesmann, Bernd and Schwering, Markus G. and Striewe, Frank},
  title     = {Innovation requires direction: How to identify the customer problems of tomorrow and possible solutions},
  series = {Kriegesmann, Bernd (Hrsg.): Berichte aus der angewandten Innovationsforschung, No. 225, Bochum},
  journal   = {Kriegesmann, Bernd (Hrsg.): Berichte aus der angewandten Innovationsforschung, No. 225, Bochum},
  year      = {2007},
  language  = {en}
}
@article{KerkaKriegesmannSchweringetal.2007,
  author    = {Kerka, Friedrich and Kriegesmann, Bernd and Schwering, Markus G. and Striewe, Frank},
  title     = {Innovation requires direction: How to identify the customer problems of tomorrow and possible solutions},
  series = {Berichte aus der angewandten Innovationsforschung No 225},
  journal   = {Berichte aus der angewandten Innovationsforschung No 225},
  year      = {2007},
  language  = {en}
}