Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) D. Bloom and S. W. S. McKeever,Trap level spectroscopy of undoped and Ga-doped Bi12GeO20 using thermally stimulated conductivity,Journal of Applied Physics,0021-8979,AIP Publishing,1995-06-15,77,12,6521-6533,https://cir.nii.ac.jp/crid/1360579819388831744,https://doi.org/10.1063/1.359061