[n] D. F. Ratner and A. Chao, “Reversible Seeding in Storage Rings”, in Proc. FEL'11, Shanghai, China, Aug. 2011, paper MOPB23, pp. 57-60.
[n] G. Geloni, V. Kocharyan, and E. Saldin, “Generation of Doublet Spectral Lines at Self-seeded X-ray FELs”, in Proc. FEL'11, Shanghai, China, Aug. 2011, paper MOPB29, pp. 77-80.
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