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Univ Udine, Dept Econ & Stat, Via Tomadini 30-A, I-33100 Udine, Italy
Univ Agder, Sch Business & Law, Dept Management, Gimlemoen 19,9i 241,Post Box 422, N-4604 Kristiansand, Norway Univ Udine, Dept Econ & Stat, Via Tomadini 30-A, I-33100 Udine, Italy