@article{Baron:1975,
  author  = "K. Baron and R. Ger and J. Matkowski",
  title   = "Analytic solutions of a system of functional equations",
  journal = "Publicationes Mathematicae - Debrecen",
  volume  = "Vol. 22",
  number  = "no 3-4",
  pages   = "189--194",
  year    = "1975",
}