@article{Matkowski:2015,
  author  = "J. Matkowski and Z. Pales",
  title   = "Characterization of generalized quasi-arthmetic means",
  journal = "Acta Scientiarum Mathematicarum",
  volume  = "Vol. 81",
  number  = "no. 3-4",
  pages   = "447--456",
  year    = "2015",
}