Joachain, CJ., Piraux, B., Potvliege, RM., Furtado, F., & Byron, FW. (1985). Unitarized Eikonal-Born Series Theory of (e,2e) Reactions in Atomic-hydrogen. Physics Letters. Section A: General, Atomic and Solid State Physics, 112A(3-4), 138-140. https://doi.org/10.1016/0375-9601(85)90674-7 (Original work published 1985)