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Table 2 Search engine and retrieved, not duplicated and selected primary studies

From: Overview and open issues on penetration test

Database Retrieved Not duplic. Selected Prec. rate Rate index
ACM DL 144 141 8 0.0555 0.1481
IEEE Xplore 531 523 32 0.0602 0.5925
SCOPUS 128 90 3 0.0234 0.0555
Springer Link 342 336 11 0.0321 0.2037
Total 1145 1090 54