@article{Szal:2009,
  author  = "B. Szal",
  title   = "Generalization of a theorem on Besov-Nikol'skii classes",
  journal = "Acta Mathematica Hungarica",
  volume  = "Vol. 125",
  number  = "no 1-2",
  pages   = "161--181",
  year    = "2009",
}