@article{Łenski:2014,
  author  = "W. Łenski and B. Szal",
  title   = "Approximation of conjugate functions by general linear operators of their Fourier series at the Lebesgue points",
  journal = "Demonstratio Mathematica",
  volume  = "Vol. 47",
  number  = "no. 4",
  pages   = "878--892",
  year    = "2014",
}