Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Seiji Uryu,Excitons and plasmons of graphene nanoribbons in infrared frequencies in an effective-mass approximation,Physical Review B,2469-9950,American Physical Society (APS),2020-10-09,102,15,,https://cir.nii.ac.jp/crid/1360290617579702912,https://doi.org/10.1103/physrevb.102.155409