Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 戸谷 友則,A RIAF Interpretation for the Past Higher Activity of the Galactic Center Black Hole and the 511 keV Annihilation Emission,Pub. Astron. Soc. Jpn 58,,,2006,,,965,https://cir.nii.ac.jp/crid/1010282256752364434,