TY - JOUR AU - Ulf Griesmann AU - J Burnett AU - R Gupta C2 - Applied Optics DA - 2002-05-01 LA - en PB - Applied Optics PY - 2002 TI - Absolute Refractive Indices and Thermal Coefficients of CaF2, SrF2, BaF2, and LiF Near 157 nm ER -