| 1 | Descriptive grammar of the Thullal Pattus by Kunchan Nambiar | |
| Researcher: | Vijayakrishnan, N | |
| Guide: | Pillai, P Ramchandran | |
| University: | University of Kerala | |
| Language: | English | |
| 2 | ||
| Researcher: | Vijayakrishnan N | |
| Guide: | Ramachandran Pillai P | |
| University: | University of Kerala | |
| Language: | English | |
| Shodhganga | ||
| 3 | ||
| Researcher: | Vijayakrishnan, N P | |
| Guide: | Lalkar, P B | |
| University: | University of Calicut | |
| Language: | Malayalam | |