Ericson, Per G.P; Cajsa L Anderson; Tom Britton; Andrzej Elzanowski; Ulf S Johansson; Mari Källersjö; Jan I Ohlson; Thomas J Parsons; Dario Zuccon; Gerald Mayr (22. desember 2006). «Diversification of Neoaves: integration of molecular sequence data and fossils». Biology Letters2 (4): 543–547. ISSN1744-9561. doi:10.1098/rsbl.2006.0523.
worldcat.org
Ericson, Per G.P; Cajsa L Anderson; Tom Britton; Andrzej Elzanowski; Ulf S Johansson; Mari Källersjö; Jan I Ohlson; Thomas J Parsons; Dario Zuccon; Gerald Mayr (22. desember 2006). «Diversification of Neoaves: integration of molecular sequence data and fossils». Biology Letters2 (4): 543–547. ISSN1744-9561. doi:10.1098/rsbl.2006.0523.