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Univ Coimbra, Fac Econ, Av Dias Silva 165, P-3004512 Coimbra, Portugal
Univ Coimbra, Dept Math, CMUC, P-3000143 Coimbra, Portugal
CeBER Ctr Business & Econ ResearchAv Dias Silva, Av Dias Silva 165, P-3004512 Coimbra, Portugal Kuwait Coll Sci & Technol, Safat 13133, Kuwait