Lombaerde, Philippe De ORCID: 0000-0002-6546-6771, Naeher, Dominik ORCID: 0000-0002-7535-6891 and Saber, Takfarinas ORCID: 0000-0003-2958-7979 (2021) Regional integration clusters and optimum customs Unions: a machine-learning approach. Journal of Economic Integration, 36 (2). pp. 262-281. ISSN 1225-651X