Table 4.
List of publishers and the number of publications surveyed.
| Database | Number of Papers |
|---|---|
| IEEE Xplore | 49 |
| ScienceDirect-Elsevier | 4 |
| MDPI | 7 |
| SpringerLink | 8 |
| Hindawi | 5 |
| Wiley | 4 |
| Inder Science Online | 1 |
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