@incollection{GurulingappaM{\"u}llerFriedrich2010,
  author    = {Gurulingappa, Harsha and M{\"u}ller, Bernd and Friedrich, Christoph M.},
  title     = {Prior art search in chemistry patents based on semantic concepts and co-citation analysis},
  series = {The nineteenth text REtrieval conference (TREC 2010) proceedings},
  year      = {2010},
  language  = {en}
}
@incollection{DechangeFriedrich2013,
  author    = {Dechange, Andr{\´e} and Friedrich, Bernd},
  title     = {Multiprojektmanagement in der Energiewirtschaft},
  series = {Projektmanagement im Energiebereich},
  publisher = {Springer Gabler},
  address   = {Wiesbaden},
  pages     = {24},
  year      = {2013},
  language  = {de}
}