@article{Słowik:2003,
  author  = "G. Słowik and A. Więckowski",
  title   = "Influence of microwave power on EPR spectra of coal macerals",
  journal = "Applied Magnetic Resonance",
  volume  = "Vol. 24",
  number  = "no 3-4",
  pages   = "437--445",
  year    = "2003",
}