See at: iris.gssi.it | ISTI Repository | CNR ExploRA
See at: ISTI Repository | dl.acm.org | ACM Computing Surveys | CNR ExploRA
See at: ISTI Repository | ieeexplore.ieee.org | CNR ExploRA
See at: ISTI Repository | doi.org | ieeexplore.ieee.org | CNR ExploRA