@article{Łenski:2010,
  author  = "W. Łenski and B. Szal",
  title   = "On the degree of strong approximation of functions and conjugate functions",
  journal = "Demonstratio Mathematica",
  volume  = "Vol. 43",
  number  = "no 1",
  pages   = "117--128",
  year    = "2010",
}