1. Interactions between Light Waves in a Nonlinear Dielectric
2. Radiometry and the Detection of Optical Radiation;Boyd,1983
3. Order-of-magnitude estimates of the nonlinear optical susceptibility
4. Power and Bandwidth of Spontaneous Parametric Emission
5. Cleveland Crystals, Inc., 19306 Redwood Road, Cleveland, Ohio 44110 USA, provides a large number of useful data sheets which may also be obtained at http://www.clevelandcrystals.com