Origin of microstructures in picosecond X-ray laser beams O. Guilbaud, A. Klisnick, K. Cassou, S. Kazamias, D. Ros, G. Jamelot, D. Joyeux and D. Phalippou Europhys. Lett., 74 5 (2006) 823-829 Published online: 10 May 2006 DOI: 10.1209/epl/i2006-10038-4