@article{Witczak:2013,
  author  = "M. Witczak and J. Korbicz and R. Józefowicz",
  title   = "Design of unknown input observers for non-linear stochastic systems and their application to robust fault diagnosis",
  journal = "Control and Cybernetics",
  volume  = "Vol. 42",
  number  = "no. 1",
  pages   = "227--256",
  year    = "2013",
}