東京大學的學生在法學圖書館翻出1985年出版品,發現能證明蔡英文論文 1985年出版的「Legal research in the United Kingdom 1905-1984 : a classified list of legal theses and dissertations successfully completed for postgraduate degrees awarded by universities and polytechnics in the United Kingdom from 1905-1984」則記載了蔡英文的博士論文條項「1313. TSAI I W London LSE PhD Unfair trade practices and safeguard actions」。