Pizzi, A., Rosolen, G., Wong, L. J., Ischebeck, R., Soljačić, M., Feurer, T., & Kaminer, I. (2020). Graphene metamaterials for intense, tunable, and compact extreme ultraviolet and X‐ray sources. Advanced Science, 7(1), 1901609 (8 pp.). https://doi.org/10.1002/advs.201901609