Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SHIGA Ryosuke and HAGIWARA Tomomichi and EBIHARA Yoshio,External Positivity of Sampled-data Systems and Their Lq/L Hankel Norm Analysis,Transactions of the Society of Instrument and Control Engineers,0453-4654,The Society of Instrument and Control Engineers,2023,59,3,92-102,https://cir.nii.ac.jp/crid/1390295658313824640,https://doi.org/10.9746/sicetr.59.92