KRACKE, G., BRIGGS, J. S., DUBOIS, A., Maquet, A., & Véniard, V. (1994). Two-photon free-free transitions in laser-assisted electron-hydrogen scattering. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 27, 3241. https://doi.org/10.1088/0953-4075/27/14/051