@article{Matkowski:1996,
  author  = "J. Matkowski",
  title   = "On a system of simultaneous iterative functional equations",
  journal = "Annales Mathematicae Silesianae",
  volume  = "nr 9",
  pages   = "123--135",
  year    = "1996",
  note    = "Uniwersytet Šl±ski, Katowice",
}