Two-color three-photon resonant excitation spectrum of strontium in the autoionization region M. Yaseen, R. Ali, A. Nadeem, S. A. Bhatti and M. A. Baig Eur. Phys. J. D, 20 2 (2002) 177-189 Published online: 19 July 2002 DOI: 10.1140/epjd/e2002-00137-8