High-order harmonic generation at high laser intensities beyond the tunnel regime Jose Antonio Pérez-Hernández, Marcelo F. Ciappina, Maciej Lewenstein, Amelle Zaïr and Luis Roso Eur. Phys. J. D, 68 7 (2014) 195 Published online: 24 July 2014 DOI: 10.1140/epjd/e2014-50086-6