@unpublished{eisl:hal-03054074, TITLE = {{External Differentiation in Access to the Single Market: Effectiveness, Accountability and Political Unity}}, AUTHOR = {Eisl, Andreas}, URL = {https://sciencespo.hal.science/hal-03054074}, NOTE = {working paper or preprint}, YEAR = {2020}, MONTH = Oct, PDF = {https://sciencespo.hal.science/hal-03054074/file/2020-eisl-euidea-pp-9.pdf}, HAL_ID = {hal-03054074}, HAL_VERSION = {v1}, }