Gopal, Ram, Pradip Kumar Jain, and Pradip Kumar Jain. “Effect of Axial Magnetic Field Tapering on Whistler-Pumped FEL Amplifier in Collective Raman Regime Operation”. International Journal of Engineering and Technology 7, no. 4 (September 5, 2018): 2044–2050. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/15298.