On the structure of categories of coalgebras

@article{Johnstone2001OnTS,
  title={On the structure of categories of coalgebras},
  author={Peter T. Johnstone and John Power and Toru Tsujishita and Hiroshi Watanabe and James Worrell},
  journal={Theor. Comput. Sci.},
  year={2001},
  volume={260},
  pages={87-117}
}