Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hashimoto D. and Shimizu K.,Spectral hole burning of hyperfine sublevels in ^<167>Er^<3+> ions doped in an Y_2SiO_5 crystal II,Meeting Abstracts of the Physical Society of Japan,2189-0803,The Physical Society of Japan,2013,68.2.2,0,132,https://cir.nii.ac.jp/crid/1390282680966338816,https://doi.org/10.11316/jpsgaiyo.68.2.2.0_132_4