Limiting cross sections for multiphoton coupling K. Boyer, H. Jara, T.S. Luk, I.A. McIntyre, A. McPherson, R. Rosman et C.K. Rhodes Rev. Phys. Appl. (Paris), 22 12 (1987) 1793-1799 DOI: 10.1051/rphysap:0198700220120179300