Verma, P., S. Gautam, S. Pal, P. Kumar, P. Chaturvedi, J.S.B.S. Rawat, P. Chaudhary, Dr. Harsh, P. Basu, and P. Bhatanagar. “Carbon Nanotube-Based Cold Cathode for High Power MicrowaveVacuum Electronic Devices: A Potential Field Emitter”. Defence Science Journal 58, no. 5 (September 1, 2008): 650-654. Accessed September 20, 2019. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1688.