Tsheten Tamang และ Pattarasinee Bhattarakosol. (2012) Identification of significant influencers on text-based CAPTCHA verification from personal characteristics. Chulalongkorn University:ม.ป.ท.Tsheten Tamang และ Pattarasinee Bhattarakosol. 2012. Identification of significant influencers on text-based CAPTCHA verification from personal characteristics. ม.ป.ท.:Chulalongkorn University;Tsheten Tamang และ Pattarasinee Bhattarakosol. Identification of significant influencers on text-based CAPTCHA verification from personal characteristics. ม.ป.ท.:Chulalongkorn University, 2012. Print.