1. R. J. Walker, T. R. Palfrey, Jr., R. O. Haxby, B. M. K. Nefkens, to be published.
2. T. White, F. J. Loeffler, T. R. Palfrey, Jr., to be published.
3. Techniques of High Energy Physics;Fitch,1961
4. Transistorized Coincidence Circuit for π‐e Experiment