@article{JMLR:v21:20-079,
  author  = {Xin Bing and Florentina Bunea and Marten Wegkamp},
  title   = {Optimal Estimation of Sparse Topic Models},
  journal = {Journal of Machine Learning Research},
  year    = {2020},
  volume  = {21},
  number  = {177},
  pages   = {1--45},
  url     = {http://jmlr.org/papers/v21/20-079.html}
}