@article{Matkowski:1994,
  author  = "J. Matkowski",
  title   = "Nonlinear contractions in metrically convex space",
  journal = "Publicationes Mathematicae - Debrecen",
  volume  = "Vol. 45",
  number  = "no 1-2",
  pages   = "103--114",
  year    = "1994",
}