@article{Liu2019a,
  author = "Z. Liu and C. Yang and S. Rüdian and S. Liu and L. Zhao and T. Wang",
  title = "Temporal emotion-aspect modeling for discovering what students are concerned about in online course forums",
  year = 2019,
  journal = "Interactive Learning Environments, 27:5-6",
  pages = "598-627",
  month = "Apr",
  doi = "10.1080/10494820.2019.1610449"
}