Reference
Friederike Spitzenberger, Edmund Weiss, Peter Sackl (2010): Massive population decline of the Critically Endangered Greater
Horseshoe Bat, Rhinolophus ferrumequinum (SCHREBER, 1774), in
Styria, south-eastern Austria, between the mid-1990s and 2009
(Mammalia, Chiroptera). – Joannea Zoologie – 11: 5 - 17.