Yuji Miyake, Yoichi Muraoka. Moving Captcha. In Hamid R. Arabnia, Victor A. Clincy, Joan Lu, Jan Smid, editors, Proceedings of the 2007 International Conference on Internet Computing, ICOMP 2007, Las Vegas, Nevada, USA, June 25-28, 2007. pages 103-108, CSREA Press, 2007.
Abstract is missing.