The Completeness of the Fossil Record of Mesozoic Birds: Implications for Early Avian Evolution Brocklehurst, Neil ; Upchurch, Paul ; Mannion, Philip D. ; O'Connor, Jingmai Abstract Publication: PLoS ONE Pub Date: June 2012 DOI: 10.1371/journal.pone.0039056 Bibcode: 2012PLoSO...739056B