@article{efficientsparsecodingusinghierarchical,
  title = {Efficient Sparse Coding using Hierarchical Riemannian Pursuit},
  author = {Ye Xue and Vincent Lau and Songfu Cai},
  year = {2021},
  eprint = {2104.10314},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2104.10314v4},
}