@article{Matkowski:2013,
  author  = "J. Matkowski",
  title   = "Generalized weigthed quasi-aritmetic means and the Kolmogorov-Nagumo theorem",
  journal = "Colloquium Mathematicum",
  volume  = "Vol. 133",
  number  = "no. 1",
  pages   = "35--49",
  year    = "2013",
}