Outline of the contents: h$`m0-'
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1. Basic Interferometers for Optical Testing 4Mg%}/cC
2. Phase-Shifting Interferometry UucX1%
3. Specialized Optical Tests O8#]7\)
4. Long Wavelength Interferometry :7X4VHw/
5. Testing of Aspheric Surfaces 0@?m"|G
6. Measurement of Surface Microstructure OH>Gc-V
7. Absolute Measurements ?wkT=mv
8. Concluding Remarks