@article{Chatterjee_Bhattacharya_2014, title={A Low Frequency Helical Antenna for Sub Surface Communication}, volume={17}, url={https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/7382}, DOI={10.14429/dsj.17.7382}, number={3}, journal={Defence Science Journal}, author={Chatterjee, B. and Bhattacharya, D.}, year={2014}, month={May}, pages={125-134} }