@article{Benedykt:1981,
  author  = "Z. Benedykt and J. Matkowski",
  title   = "Remarks on some fixed point theorem",
  journal = "Demonstratio Mathematica",
  volume  = "Vol. 14",
  number  = "no 1",
  pages   = "227--232",
  year    = "1981",
}