Recommender systems: An introduction. Jannach, D., Zanker, M., Felfernig, A., & Friedrich, G. Cambridge University Press, 2010.
bibtex   
@book{jannach2010,
  title={Recommender systems: An introduction},
  author={Jannach, Dietmar and Zanker, Markus and Felfernig, Alexander and Friedrich, Gerhard},
  year={2010},
  publisher={Cambridge University Press}
}
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