1. J. Badier et al., to be published.
2. Acheson DAG 213 manufactured by Acheson Colloiden N.V., Scheemda, The Netherlands.
3. Electrostatic problems in multiwire proportional chambers
4. Hybrid amplifier LMT 434 designed by Le Matériel Téléphonique, 46–47, Quai Alphonse Le Gallo, 92100 Boulogne, France.
5. J. Caillet, Laboratoire Accélérateur Linéaire Orsay, Internal Report.