Spielmann, C.; Burnett, N. H.; Sartania, S.; Koppitsch, R.; Schnürer, M.; Kan, C.; Lenzner, M.; Wobrauschek, P.; Krausz, F. (24 Oct 1997). "Generation of Coherent X-rays in the Water Window Using 5-Femtosecond Laser Pulses". Science. 278 (5338): 661–664. Bibcode:1997Sci...278..661S. doi:10.1126/science.278.5338.661.
Spielmann, C.; Burnett, N. H.; Sartania, S.; Koppitsch, R.; Schnürer, M.; Kan, C.; Lenzner, M.; Wobrauschek, P.; Krausz, F. (24 Oct 1997). "Generation of Coherent X-rays in the Water Window Using 5-Femtosecond Laser Pulses". Science. 278 (5338): 661–664. Bibcode:1997Sci...278..661S. doi:10.1126/science.278.5338.661.