@article{liu1999,
  author  = {Liu, Priya and Banerjee, Jun and Iyer, Elena},
  title   = {Hidden Markov Modelling for Activated Sludge Treatment},
  journal = {Open Access Journal of Engineering Applications},
  year    = {1999},
  volume  = {23},
  number  = {1},
  pages   = {927-932},
  issn    = {3105-7004},
  doi     = {10.55555/oajea.1999.2301.046},
  url     = {https://journal.bsaps.com/article/7613}
}