@article{Guzik:2003,
  author  = "G. Guzik and W. Jarczyk and J. Matkowski",
  title   = "Cocycles of continuous iteration semigroups",
  journal = "Bulletin of the Polish Academy of Sciences : Mathematics",
  volume  = "Vol. 51",
  number  = "no 2",
  pages   = "185--197",
  year    = "2003",
}