Collaborative Filtering beyond the User-Item Matrix

@article{Shi2014CollaborativeFB,  title={Collaborative Filtering beyond the User-Item Matrix},  author={Yue Shi and Martha Larson and Alan Hanjalic},  journal={ACM Computing Surveys (CSUR)},  year={2014},  volume={47},  pages={1 - 45},  url={https://api.semanticscholar.org/CorpusID:5493334}}
A comprehensive introduction to a large body of research, more than 200 key references, is provided, with the aim of supporting the further development of recommender systems exploiting information beyond the U-I matrix.

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