Outline of the contents: *E$D,
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1. Basic Interferometers for Optical Testing <c\aZ9+V
2. Phase-Shifting Interferometry Hy `r}+
3. Specialized Optical Tests RsV<*s
4. Long Wavelength Interferometry =r_ SMTu
5. Testing of Aspheric Surfaces l|&|+u#
6. Measurement of Surface Microstructure @8CD@SDv
7. Absolute Measurements Vm6^'1CY
8. Concluding Remarks