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doi.org/10.1063/1.1591251
Appl. Phys. Lett.

Gürtler, A., Meijer, A. S., & van der Zande, W. J. (2003). Imaging of terahertz radiation using a Rydberg atom photocathode. Appl. Phys. Lett., 83, 222–224. doi:10.1063/1.1591251