@article{Kahlig:2003,
  author  = "P. Kahlig and J. Matkowski",
  title   = "A solution of a problem of Z. Daróczy on mixing-arithmetic means",
  journal = "Acta Scientiarum Mathematicarum",
  volume  = "Vol. 69",
  pages   = "49--56",
  year    = "2003",
}