@article{Pawlak:2020,
  author  = "M. Pawlak and M. Kruk and J. Zawodniak and S. Pasikowski",
  title   = "Investigating factors responsible for boredom in English classes: The case of advanced learners",
  journal = "SYSTEM",
  volume  = "Vol. 91",
  pages   = "1--10",
  year    = "2020",
}