@phdthesis{dnb-825,
  title = {Hybrid approaches for sentiment analysis},
  author = {Michael Wiegand},
  year = {2011},
  url = {http://d-nb.info/1051056640},
  researchr = {https://researchr.org/publication/dnb-825},
  cites = {0},
  citedby = {0},
  school = {Saarland University},
}