1. Stimulated Optical Radiation in Ruby
2. Infrared and Optical Masers
3. Int. Conf. on Quantum Electronics, Shawanga Lodge, High View, New York (1959), published as a monograph by Columbia University Press, New York (1960), edited by C. H. TOWNES.
4. Advances in Quantum Electronics;SINGER,1961
5. R2 Line Optical Maser Action in Ruby