Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ogata Masato and Nishi Tetsuo,A Topological Condition for an RC Active Circuit Containing Op-amps to be Unstable,九州大学大学院システム情報科学紀要,13423819,"Faculty of Information Science and Electrical Engineering, Kyushu University",2000-09-26,5,2,179-185,https://cir.nii.ac.jp/crid/1390290699820296320,https://doi.org/10.15017/1524314