| 1 | Investigation of lower ionosphere through the study of longwave propagation and sid effects  | 
| Researcher: | Mangal Sain | 
| Guide: | Mitra, S N | 
| University: | University of Delhi | 
| Language: | English | 
| 2 | Investigation of lower ionosphere through the study of longwave propagation and SID effects  | 
| Researcher: | Luthra, Mangal Sain | 
| University: | University Of Delhi | 
| Language: | English | 
| 3 | |
| Researcher: | Malik, Mangal Sain | 
| University: | Ch Charan Singh University | 
| Language: | English |