Byron, FW., Joachain, CJ., & Piraux, B. (1985). Eikonal-born Series Theory of (e,2e) Reactions in Atomic-hydrogen. Journal of Physics B: Atomic, Molecular and Optical Physics, 18(15), 3203-3218. https://doi.org/10.1088/0022-3700/18/15/026 (Original work published 1985)