TY - CONF AU - Chu-Shik Kang AU - Ulf Griesmann AU - Johannes Soons C2 - XX IMEKO World Congress; Metrology for Green Growth, Busan, KR DA - 2012-09-09 00:09:00 LA - en PB - XX IMEKO World Congress; Metrology for Green Growth, Busan, KR PY - 2012 TI - Measurement of the diameter variation and refractive index inhomogeneity of a fused silica sphere using four-surface phase-shifting interferometry ER -