E. van den Berg

Engeln, R. ., van den Berg, E. ., Meijer, G. ., Lin, L. ., Knippels, G. ., & van der Meer, A. F. G. (1997). Cavity ring down spectroscopy with a free-electron laser. Chemical Physics Letters, 269, 293-297. https://doi.org/10.1016/s0009-2614(97)00292-3 (Original work published)