@article{Wojtowicz:2005,
  author  = "W. Wojtowicz and A. Więckowski",
  title   = "EPR study of ammonium nitrate doped with copper(II) ions",
  journal = "Acta Physica Polonica A",
  volume  = "Vol 108",
  number  = "no 2",
  pages   = "395--401",
  year    = "2005",
}