Chiang, C.-T., Blättermann, A., Huth, M., Kirschner, J., & Widdra, W. (2013). Oscillator-based High-order Harmonic Generation at 4MHz for Applications in Time-of-Flight Photoemission Spectroscopy. EPJ Web of Conferences, 41: 01019. doi:10.1051/epjconf/20134101019.