Low-divergence, soft X-ray harmonic combs with tunable line spacing from necklace-structured driving lasers

1. Rego, L.
2. Brooks, N.J.
3. Nguyen, Q.L.D.
4. Román, J.S.
5. Binnie, I.
6. Plaja, L.
7. Kapteyn, H.C.
8. Murnane, M.M.
9. Hernández-García, C.