Okland, B. et al., 2005. Regional diversity of mycetophilids (Diptera: Sciaroidea) in Scandinavian oak-dominated forests. Biological Conservation, 121, pp.9-20. Available at: http://www.online-keys.net/sciaroidea/2000_/Okland_et_al_2005_regional_Mycetophilidae.pdf.