Classification and Acquisition of Contradictory Event Pairs using Crowdsourcing. - Yu Takabatake; Hajime Morita; Daisuke Kawahara; Sadao Kurohashi; Ryuichiro Higashinaka; Yoshihiro Matsuo (EVENTS@HLP-NAACL, 2015)

An Anonymous Distributed Electronic Voting System Using Zerocoin. - Yu Takabatake; Yasuo Okabe (ICOIN, 2021)