@article{Piontek:1999,
  author  = "M. Piontek",
  title   = "Use of a planarian Dugesia tigrina Girard in the studies of acute toxicity of organic substances",
  journal = "Polskie Archiwum Hydrobiologii",
  volume  = "Vol. 46",
  number  = "nr 3-4",
  pages   = "331--338",
  year    = "1999",
}