@article{Kubiak:2018,
  author  = "M. Kubiak and W. Łenski and B. Szal",
  title   = "Pointwise approximation of modified conjugate functions by matrix operators of conjugate Fourier series of 2\pi/r-periodic functions",
  journal = "Journal of Inequalities and Applications",
  volume  = "Vol. 92",
  pages   = "1--14",
  year    = "2018",
}