Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yuzuru Kato and Jinjie Zhu and Wataru Kurebayashi and Hiroya Nakao,Asymptotic Phase and Amplitude for Classical and Semiclassical Stochastic Oscillators via Koopman Operator Theory,Mathematics,2227-7390,MDPI AG,2021-09-07,9,18,2188,https://cir.nii.ac.jp/crid/1360013168842007040,https://doi.org/10.3390/math9182188