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Summary of the number of articles processed in the review
| Indexer | Results | Profiteered | Relevant |
|---|---|---|---|
| IEEE Xplore | 125 | 20 | 70 |
| Science direct | 42 | 17 | 19 |
| ACM digital library | 33 | 15 | 17 |
| Scopus | 30 | 18 | 10 |
| Elsevier | 28 | 9 | 12 |
| Springer link | 28 | 10 | 13 |
| EBSCO host | 26 | 9 | 14 |
| Taylor and Francis | 20 | 7 | 9 |
| World of science (WoS) | 25 | 8 | 11 |
| Research gate | 20 | 6 | 8 |
| Google scholar | 29 | 8 | 10 |
| Others | 28 | 8 | 7 |
| Total | 434 | 135 | 200 |
