Two-color three-photon resonant excitation spectrum of strontium in the autoionization regionM. Yaseen, R. Ali, A. Nadeem, S. A. Bhatti and M. A. BaigEur. Phys. J. D, 20 2 (2002) 177-189DOI: https://doi.org/10.1140/epjd/e2002-00137-8