Elliptic dichroism in hydrogen ionization by a coherent superposition of two harmonics M. Fifirig, A. Cionga and F. Ehlotzky Eur. Phys. J. D, 23 3 (2003) 333-336 Published online: 29 April 2003 DOI: 10.1140/epjd/e2003-00097-5