| 1 | |
| Researcher: | Nag, Ratna |
| University: | Banaras Hindu University |
| Language: | English |
| 2 | |
| Researcher: | Ray Chaudhuri, Ratna |
| University: | Banaras Hindu University |
| Language: | English |
| 3 | |
| Researcher: | Ratna Kumar, Veerathu |
| Guide: | Rao, B G S |
| University: | Andhra University |
| Language: | English |