@article{804711, author = {H Lawler and J Rehr and F Vila and SD Dalosto and Eric Shirley and Zachary Levine}, title = {Optical to UV spectra and birefringence of SiO2 and TiO2:  first-principles calculations with excitonic effects}, year = {2008}, month = {2008-01-01 00:01:00}, publisher = {Physical Review B (Condensed Matter and Materials Physics)}, language = {en}, }