1. Luxembourg Institute of Socio‐Economic Research Esch‐sur‐Alzette Luxembourg
2. Université catholique de Louvain, Center for Operations Research and Econometrics Louvain‐la‐Neuve Belgium
3. University of Rouen, IDEES Laboratory UMR 6266 CNRS France
4. Université du Luxembourg, Institute of Geography and Spatial Planning Esch‐sur‐Alzette Luxembourg