"Electromagnetically enriched isotopes and mass spectrometry / proceedings of the conference held in the Cockcroft Hall, Harwell, 13-16 September 1955 ; edited by M. L. Smith ; Sponsored by the Atomic Energy Research Establishment, Harwell / London : Butterworths scientific publications , 1956" . . . . . "1956"^^ . . . "5"^^ . .