@article{Matkowski:2017,
  author  = "J. Matkowski and M. Nowicka and A. Witkowski",
  title   = "Explicit solutions of the invariance equation for means",
  journal = "Results in Mathematics",
  volume  = "Vol. 71",
  number  = "iss. 1",
  pages   = "397--410",
  year    = "2017",
}