@article{weko_146123_1,
   author	 = "Shotaro,Sano and Takuma,Otsuka and Katsutoshi,Itoyama and Hiroshi,G.,Okuno",
   title	 = "HMM-based Attacks on Google's ReCAPTCHA with Continuous Visual and Audio Symbols",
   journal	 = "Journal of information processing",
   year 	 = "2015",
   volume	 = "23",
   number	 = "6",
   pages	 = "814--826",
   month	 = "nov"
}