Panwar, J., S. C. Sharma, and R. Sharma. “Terahertz Radiation Emission from A Surface Wave Pumped Free Electron Laser”. Journal of Atomic, Molecular, Condensed Matter and Nano Physics, vol. 2, no. 3, Dec. 2015, pp. 169-78, doi:10.26713/jamcnp.v2i3.337.