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R. M. Ennis, B. Donnally, D. E. Schechter, D. B. Schlafke, and G. Thoeming, “Production of Negative Helium Ions by Nearly-Resonant Charge Exchange in Potassium”, in Proc. 2nd Particle Accelerator Conf. (PAC'67), Washington D.C., USA, Mar. 1967, pp. 75-78. |
