@article{weko_95215_1, author = "鴨志田,芳典 and 菊池,浩明", title = "マルコフ連鎖による合成文章の不自然さを用いたCAPTCHAの提案と安全性評価", journal = "情報処理学会論文誌", year = "2013", volume = "54", number = "9", pages = "2156--2166", month = "sep" }