Reference

Eva Schweiger-Chwala, Johann Waringer (1996): Association patterns and habitat selection of dragonflies (Insecta: Odonata) at different types of Danubian backwaters at Vienna, Austria. – Archiv fuer Hydrobiologie (und Planktonkunde). Frueher: Forschungsberichte aus der Biologischen Station zu Loen. Berlin. – Suppl. 115: 45 - 60.