1. V.V. Kulish. The physics of free electron lasers. General principles. Deposited in Ukrainian Scientific Research Institute of Technical Information, Kiev, 05 Sep 1990.
2. V.V. Kulish, O.B. Krutko. Amplification property of free electron lasers with combined transversal EH-ubitron pumping. Rus. Letters for the Journal of Technical Physics, 21(11):47–51, 1995.
3. V.V. Kulish, O.B. Krutko. Free electron laser with combinative crossed EH-ubitron pumping. Vestnik Sumy State University, 2:10–21, 1995.
4. V.V. Kulish. Hierarchical oscillations and averaging methods in nonlinear problems of relativistic electronics. The International Journal of Infrared and Millimeter Waves, 18(5):1053–1117, 1997.
5. V.V. Kulish, P.B. Kosel. A new principle of acceleration of high power pulses of quasi-neutral plasmas and charged particles. In Proc. of 11th IEEE International Pulsed Power Conference, pages 1:667–672, Baltimore, Maryland, 1998.