@unpublished{Choné2008,
author = {Phillippe Choné and Guy Laroque},
title = {Optimal taxation in the extensive model},
year = {2008},
month = {Nov},
volume = {pp.},
doi = {10.1920/wp.ifs.2008.0808},
issn = {1742-0415},
url = {http://www.ifs.org.uk/wps/wp0808.pdf},
}