@TechReport{AbbeBierTole05,
author = {Emmanuel Abbe and Michel Bierlaire and Tomer Toledo },
title = {Normalization and correlation of cross-nested logit models},
institution = {Operations Research Group ROSO, Ecole Polytechnique F\'ed\'erale de Lausanne},
number = {RO-050912},
note = {Published as Abbe, E., Bierlaire, M., and Toledo, T. (2007). Normalization and correlation of cross-nested logit models, Transportation Research Part B: Methodological41(7):795-808},
year = {2005}
}