@article{Szal:2011,
  author  = "B. Szal",
  title   = "On the integral modulus of continuity of Fourier series",
  journal = "Acta Mathematica Hungarica",
  volume  = "Vol. 131",
  number  = "no 1-2",
  pages   = "138--159",
  year    = "2011",
}