@article{Matkowski:1977,
  author  = "J. Matkowski",
  title   = "Fixed point theorems for mappings with a contractive iterate at a point",
  journal = "Proceedings of the American Mathematical Society",
  volume  = "Vol. 62",
  number  = "no 2",
  pages   = "344--348",
  year    = "1977",
}