TY - JOUR AU - Park, Jungjae AU - Chen, Lingfeng AU - Wang, Quandou AU - Griesmann, Ulf C2 - Optics Express DA - 2012-08-17 00:08:00 LA - en PB - Optics Express PY - 2012 TI - A modified Roberts-Langenbeck test for measuring thickness and refractive index variation of silicon wafers ER -