References
- Gillen 1994, Image stack provided by Dr. Greg Gillen,  Surface and Microanalysis Science Division,  NIST.   (personal communication)
 
- Russ, John C, Computer Assisted Microscopy., Plenum Press, New York, 1990.
 
- Russ, John C, The Image Processing Handbook, 2nd ed., CRC Press, Boca Raton, FL, 1994.
 
- Steel, 1993, TEM Filter image provided by Dr. Eric  Steel, Surface and Microanalysis 
Science Division,  NIST.   (personal communication)
 
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