1 M.. Spanner, J.. Mikosch, A.E. Boguslavskiy, M.. Murnane, A.. Stolow, and S.. Patchkovsk, Physical Review A 85, (2012).
1 W.. Li, X.. Zhou, R.M. Lock, S.. Patchkovsk, A.. Stolow, H.. Kapteyn, and M.. Murnane, Science 322, (2008).