Habs, D., Hegelich, M., Schreiber, J., Gross, M., Henig, A., Kiefer, D., & Jung, D. (2008). Dense laser-driven electron sheets as relativistic mirrors for coherent production of brilliant X-ray and γ-ray beams. Applied Physics B - Lasers and Optics, 93(2-3 Sp. Iss. Sp. Iss. SI), 349-354. doi:10.1007/s00340-008-3239-4.