@article{tagawareordinalsparsefactoranalysisfor,
  title = {Tag-Aware Ordinal Sparse Factor Analysis for Learning and Content Analytics},
  author = {Andrew S. Lan and Christoph Studer and Andrew E. Waters and Richard G. Baraniuk},
  year = {2014},
  eprint = {1412.5967},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1412.5967v1},
}