Hierarchical Itemspace Rank: Exploiting hierarchy to alleviate sparsity in ranking-based recommendation

@article{Nikolakopoulos2015HierarchicalIR,
  title={Hierarchical Itemspace Rank: Exploiting hierarchy to alleviate sparsity in ranking-based recommendation},
  author={Athanasios N. Nikolakopoulos and Marianna A. Kouneli and John D. Garofalakis},
  journal={Neurocomputing},
  year={2015},
  volume={163},
  pages={126-136}
}
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