1. Rf guns: bright injectors for FEL
2. D.G. Myakishev, V.P. Yakovlev, Proceedings of the PAC, Vol. 5, 1991, pp. 3002.
3. M. Pekeler et al., Proceedings of the PAC, New York, 1999, p. 245.
4. Proceedings of the of the FEL99, Hamburg, 1999;Barhels;Nucl. Instr. and Meth. A,2000
5. T. Tajima et al., Proceedings of the PAC, Vol. 1, 1999, p. 440.