Relativistic high harmonics and (sub-)attosecond pulses: relativistic spikes and relativistic mirror A. Pukhov, T. Baeva, D. an der Brügge and S. Münster Eur. Phys. J. D, 55 2 (2009) 407-414 Published online: 23 June 2009 DOI: 10.1140/epjd/e2009-00187-4