@TechReport{AtaSalLeoBier_2011,
author = {Bilge Atasoy and Matteo Salani and Claudio Leonardi and Michel Bierlaire },
title = {Clip-Air, a flexible air transportation system},
institution = {Transport and Mobility Laboratory, Ecole Polytechnique F\'ed\'erale de Lausanne},
number = {TRANSP-OR 110929},
year = {2011}
}