1. A T Forrester, R A Gudmundsen and P O Johnson, Phys Rev 99 (1955) 1691.
2. A T Forrester, J Opt Soc Am, 51 (1961) 253.
3. F A Johnson, T P McLean and E R Pike, Proc Int Conf of the Physics of Quantum Electronics, Puerto Rico, 1965, Eds P L Kelley, B Lax and P E Tannenwald (New York: McGraw-Hill 1966).
4. E R Pike, Nuovo-Cunento 1 (1969) 277.
5. ER Pike and E Jakeman “Photon statistics and photon correlation spectroscopy” Adv in Qu Electronics 2, Ed D Goodwin (Academic Press 1973).