Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sato Katsuaki,Electronic Origin of Negative Dielectric Permittivity,JEMEA Bulletin,2434-1495,Japan Society of Electromagnetic Wave Energy Applications,2017,3,2,11-16,https://cir.nii.ac.jp/crid/1390282763132886272,https://doi.org/10.32304/jemeabulletin.3.2_11