Here's the citation for the paper:
Phillip. L. Manning, Nicholas P. Edwards, Roy A. Wogelius, Uwe
Bergmann, Holly E. Barden, Peter L. Larson, Daniela Schwarz-Wings,
Victoria M. Egerton, Dimosthenis Sokaras, Roberto A. Mori and
William I. Sellers (2013)
Synchrotron-based chemical imaging reveals plumage patterns in a 150
million year old early bird.
Journal of Analytical Atomic Spectrometry (advance online article)
DOI: 10.1039/C3JA50077B
http://pubs.rsc.org/en/content/articlelanding/2013/ja/c3ja50077b