@article{Łenski:2004,
  author  = "W. Łenski and B. Roszak",
  title   = "On the rate of pointwise strong summability of Fourier series",
  journal = "Demonstratio Mathematica",
  volume  = "Vol. 37",
  number  = "no 3",
  pages   = "601--610",
  year    = "2004",
}