Dong, H.-R.H.-R.DongDAR-ZEN CHENHuang, M.-H.M.-H.Huang2021-02-042021-02-042019Dong, H.-R.;Chen, D.-Z.;Huang, M.-H.https://www.scopus.com/inward/record.url?eid=2-s2.0-85075912931&partnerID=40&md5=9245770356c084e97dc7b712948e2149https://scholars.lib.ntu.edu.tw/handle/123456789/547439Are invalid patents still cited?journal article10.1002/pra2.1172-s2.0-85075912931