1. Gaseous Electronics, Some Applications;Phelps,1974
2. An Introduction to Gas Lasers: Population Inversion Mechanisms;Willett,1974
3. Electric Discharge Lamps;Waymouth,1971
4. The positive column of low-pressure Hg/Ne and Hg/Ne/Ar discharges
5. J. Polman, H. van Tongeren and T.G. Verbeek, Philips tech. Rev., to be published.