王文基沈志中易鵬2020-03-062020-03-0619990303-0849https://scholars.lib.ntu.edu.tw/handle/123456789/471411第二拓樸論journal article10.6637/CWLQ.1999.28(7).66-100http://dx.doi.org/10.6637/CWLQ.1999.28(7).66-100