國立臺灣大學數學系Chen, J.A.J.A.Chen2017-02-232018-06-282017-02-232018-06-282014http://ntur.lib.ntu.edu.tw//handle/246246/271170264737 bytesapplication/pdfFactoring threefold divisorial contractions to pointsjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/271170/1/1106.1705.pdf