1. R. D. McCarty, NBS Tech. Note 631 (1972).
2. M. Morpurgo, CERN, private communication.
3. CERN Courier,“Villigen Superconducting Muon Channel Begins Operation,” 15(2):36 (1975).
4. M. MacAshan, Stanford University, private communication.
5. M. A. Green, IEEE Trans. Nucl Sci. NS-18:669 (1971).