@article{diversityandsparsityanewperspectiveon,
  title = {Diversity and Sparsity: A New Perspective on Index Tracking},
  author = {Yu Zheng and Timothy M. Hospedales and Yongxin Yang},
  year = {2018},
  eprint = {1809.01989},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1809.01989v2},
}