@ARTICLE{Li:CompSec2020,
  author =       {Hern¨˘ndez-Castro, Carlos Javier and Li, Shujun and R-Moreno, Mar¨Şa~D.},
  title =        {All About Uncertainties and Traps: Statistical Oracle-based Attacks on a New {CAPTCHA} Protection Against Oracle Attacks},
  journal =      {Computers \& Security},
  year =         {2020},
  volume =       {92},
  articleno =    {101758},
  pages =        {101758:1-101758:12},
  doi =          {10.1016/j.cose.2020.101758},
  note =         {preprint available online at \url{http://www.hooklee.com/pub.html}},
}