@article{Matkowski:2018,
  author  = "J. Matkowski",
  title   = "Characterization of the Euler gamma function with the aid of an arbitrary mean",
  journal = "Publicationes Mathematicae - Debrecen",
  volume  = "Vol. 93",
  number  = "no. 1-2",
  pages   = "163--170",
  year    = "2018",
}