@unpublished{Bayer2013,
author = {Ralph Bayer and Subir Bose and Matthew Polisson and Ludovic Renou},
title = {Ambiguity revealed},
year = {2013},
month = {Mar},
doi = {10.1920/wp.ifs.2013.1305},
url = {http://www.ifs.org.uk/wps/wp1305.pdf},
}