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4. Grejda, R. D., 2002, “Use and Calibration of Ultra Precision Axes of Rotation with Nanometer Level of Metrology,” Ph.D. thesis, Penn State University, State College, PA.
5. Morgan, V. T., and Brown, D. E., 1969, “A Differential-Capacitance Transducer for Measuring Small Displacements,” J. Phys. E, 2, pp. 793–795.