@TechReport{HessBierPola04,
author = {Stephane Hess and Michel Bierlaire and John Polak },
title = {Estimation of value-of-time using Mixed Logit models},
institution = {Operations Research Group ROSO, Ecole Polytechnique F\'ed\'erale de Lausanne},
number = {RO-040528},
year = {2004}
}