Extension of the cut-off in high harmonic generation using two delayed pulses of the same colour, J.A. Pérez-Hernández
D.J. Hoffmann, A. Zaïr, L.E. Chipperfield, L. Plaja, C. Ruiz, J.P. Maranagos and L. Roso, Journal of Physics B: Atomic, molecular and optical physics, 42, 134004
10.1088/0953-4075/42/13/134004