1. Simple Technique for Observing Subsurface Damage in Machining of Ceramics
2. 5. W. A. Ellingson, D. M. Ayaz, M. P. Brada, and W. O'Connell , "Detection of Subsurface Defects in Machined Silicon Nitride Ceramics by Optical Scattering Methods"; pp. 147 -57 inNIST Special Publication, Vol. 847, Machining of Advanced Materials. National Institute of Standards and Technology, Washington, DC, 1993 .