@article{Gronau:2003,
  author  = "D. Gronau and J. Matkowski",
  title   = "Another characterization of the gamma function",
  journal = "Publicationes Mathematicae - Debrecen",
  volume  = "Vol. 63",
  number  = "no 1-2",
  pages   = "105--113",
  year    = "2003",
}