Table 2: Distribution of studies found.

Studies

SourcesSearch dateFoundNot repeatedRelevantPrimaries%
Science@Direct15/08/2008175143531923,8
Wiley InterScience27/09/20083020171316,3
IEEE Digital Library17/08/20086649191418,8
ACM Digital Library16/08/2008497355803241,3
Total76856717078100,0