Shi X., W. You, Y. Zhang, Z. Tao, P.M. Oppeneer, X. Wu, R. Thomale, K. Rossnagel, M. Bauer, H. Kapteyn, and M. Murnane, Science Advances5, eaav4449(2019).
You W., P.M. Tengdin, C. Chen, X. Shi, D. Zusin, Y. Zhang, C. Gentry, A. Blonsky, M. Keller, P.M. Oppeneer, and H. Kapteyn, Physical Review Letters121, (2018).