Table 5: Selected libraries and initially retrieved results.
| No | Database Name | Web address | No of Initially Retrieved |
| 1 | ACM Digital Library | http://dl.acm.org/ | 40 |
| 2 | ScienceDirect | http://www.sciencedirect.com/ | 76 |
| 3 | Scopus | https://www.scopus.com/ | 433 |
| 4 | IEEE Xplore | http://ieeexplore.ieee.org/ | 105 |
| 5 | Web of Science | https://webofknowledge.com/ | 209 |
| Total Number of papers | 863 | ||