[n] D. R. Walz, L. R. Lucas, E. J. Seppi, R. J. Vetterlein, and H. A. Weidner, “Beam Dumps, Energy Slits and Collimators at SLAC - - Their Final Versions and First Performance Data”, in Proc. PAC'67, Washington D.C., USA, Mar. 1967, pp. 923-928.
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