Table 2.
Search databases and number for articles.
| S/N | Article Sources | URL | No. of Articles | Percentage (%) |
|---|---|---|---|---|
| 1. | Science Direct | http://www.sciencedirect.com/ | 25 | 32.1 |
| 2. | Google Scholar | https://scholar.google.com/ | 20 | 25.6 |
| 3. | IEEE Explore | http://www.ieeexplore.ieee.org/ | 12 | 15.4 |
| 4. | Springer | http://www.springer.com/ | 8 | 10.3 |
| 5. | ACM Digital library | http://dl.acm.org/ | 4 | 5.1 |
| 6. | Web of Science | https://apps.webofknowledge.com/ | 4 | 5.1 |
| 7. | Taylor & Francis | http://taylorandfrancis.com/ | 2 | 2.6 |
| 8. | EBSCOHOST | http://ebsco.com/ | 2 | 2.6 |
| 9. | Wiley Online Library | http://onlinelibrary.wiley.com/ | 1 | 1.3 |
| Total = | 78 | 100.0 |