DOI:10.1642/0004-8038(2001)118[http://www.inhs.uiuc.edu/~kjohnson/kpj_pdfs/Auk.2001.pdf PDF fulltext* Mlíkovský, Jirí (2002): "Cenozoic Birds of the World, Part 1: Europe".
DOI:10.1642/0004-8038(2001)118[http://www.inhs.uiuc.edu/~kjohnson/kpj_pdfs/Auk.2001.pdf PDF fulltext* Mlíkovský, Jirí (2002): "Cenozoic Birds of the World, Part 1: Europe".