TY - JOUR AU - Leibrandt, David AU - Thorpe, Michael AU - Rosenband, Till C2 - Physical Review B DA - 2013-03-06 LA - en M1 - 15 PB - Physical Review B PY - 2013 TI - Shifts of optical frequency references based on spectral hole burning in Eu3+:Y2SiO5 UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=912630 ER -