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ANNALI DELL'UNIVERSITA' DI FERRARA > 2013 > 59 > 1 > 187-198
Foundations of Science > 2013 > 18 > 1 > 43-74
Foundations of Science > 2012 > 17 > 1 > 51-89
Computer Methods in Applied Mechanics and Engineering > 2008 > 197 > 49-50 > 4379-4382
Fuzzy Sets and Systems > 2008 > 159 > 6 > 730-738