1. “Electronics: The Death Ray Next?”Newsweek, July 18, 1960, p. 78.
2. John A. Osmundsen , “Light amplification claimed by scientist,”New York Times, July 8, 1960, p. 1;
3. “Light amplifier extends spectrum,”Electronics, July 22, 1960, p. 43.
4. G. Basalla ,The Evolution of Technology, Cambridge University Press, Cambridge (1988).
5. A. Einstein , “On the quantum theory of radiation,” inLaser Theory, F. A. Barnes , ed., pp. 5–21, IEEE Press, New York (1972).