@article{Więckowski:2005,
  author  = "A. Więckowski and L. Kozdrowska and J. Grudzińska",
  title   = "Two-component EPR spectra of brown coal",
  journal = "Karbo",
  volume  = "R. 50",
  number  = "nr 4",
  pages   = "233--237",
  year    = "2005",
}