Key points are not available for this paper at this time.
Submitted by André Paixão (apaixao@lnec. pt) on 2014-10-06T10: 31: 55Z. of bitstreams: 1 2013. pdf: 77382 bytes, checksum: 9beb870041624cd22eb33c696762347c (MD5)
Fortunato et al. (Tue,) studied this question.