&rfr_id=info%3Asid%2Fwww.hebis.de%3AHeBIS&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.isbn=954-642-256-8&rft.date=2005&rft.btitle=Species ecology along a European gradient: Maculinea butterflies as a model&rft.place=Sofia [u.a.]&rft.pub=Pensoft&rft.tpages=XVI, 289 S.&rft.genre=book