TY - JOUR AU - Schmitz, Tony AU - Beckwith, J C2 - Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology DA - 2003-01-02 LA - en M1 - 27 PB - Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology PY - 2003 TI - An investigation of two unexplored periodic error sources in differential-path interferometry ER -