Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) "Kanno, Sugumi and Sasaki, Misao and Tanaka, Takahiro",Vacuum state of the Dirac field in de Sitter space and entanglement entropy,Journal of High Energy Physics,1029-8479,Springer Berlin Heidelberg,2017-03,2017,03,,https://cir.nii.ac.jp/crid/1050564285808213248,https://doi.org/10.1007/jhep03(2017)068