@inproceedings{oai:shizuoka.repo.nii.ac.jp:00011737,
 author = {Sano, Ayane and Fujita, Masahiro and Nishigaki, Masakatsu},
 book = {2016 14th Annual Conference on Privacy, Security and Trust (PST)},
 month = {Apr},
 note = {2016 14th Annual Conference on Privacy, Security and Trust (PST)
Date of Conference: 12-14 December 2016
Conference Location: Auckland, New Zealand, application/pdf},
 publisher = {IEEE},
 title = {Directcha : A proposal of spatiometric mental rotation CAPTCHA},
 year = {2017}
}