@article{karydi2015on,
  title={On the effect of data sparsity to the performance of a Collaborative Filtering algorithm on a GPU}
  author={Karydi, Efthalia and Margaritis, Konstantinos and Vainikko, Eero}
  journal={ICT Innovations 2015, Web Proceedings ISSN null}
  pages={173--182}
  year={2015}
}