@TechReport{GleAtaBie_2012,
author = {Aur\'elie Glerum and Bilge Atasoy and Michel Bierlaire },
title = {Using semi-open questions to integrate perceptions in choice models},
institution = {Transport and Mobility Laboratory, Ecole Polytechnique F\'ed\'erale de Lausanne},
number = {TRANSP-OR 120325},
year = {2012}
}