Sub-milliradiant divergence soft-X-ray laser by active plasma waveguiding in -pinch capillary dischargeA. Ritucci, G. Tomassetti, A. Reale, L. Palladino, L. Reale, F. Flora, L. Mezi, S. V. Kukhlevsky, A. Faenov, T. Pikuz, J. Kaiser and O. ConsorteEurophys. Lett., 63 5 (2003) 694-700DOI: https://doi.org/10.1209/epl/i2003-00571-0