@article{Myszograj:2018,
  author  = "S. Myszograj and A. Stadnik and E. Płuciennik-Koropczuk",
  title   = "The influence of trace elements on anaerobic digestion process",
  journal = "Civil and Environmental Engineering Reports",
  volume  = "No. 28 (4)",
  pages   = "105--115",
  year    = "2018",
  note    = "University of Zielona Góra Press, Zielona Góra",
}