Department of Industrial Engineering
University of Salerno
Via Ponte Don Melillo, 84084, Fisciano (SA), Italy
Centre of Research for Pure and Applied Mathematics
c/o Department of Electronic and Computer Engineering
University of Salerno
Via Ponte Don Melillo, 84084, Fisciano (SA), Italy
Copyright © 2012 Nicola Pasquino, Luigi Rarità et al. This is
an open access article distributed under the Creative Commons Attribution
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medium, provided the original work is properly cited.