Instruct: Given a scientific paper title, retrieve paper titles that are cited by the given paper.
Query: Drag and Drop: A Better Approach to CAPTCHA
Usability of CAPTCHAs or usability issues in CAPTCHA design
Automatic Generation of Game-based CAPTCHAs
Hacking Chinese Touclick CAPTCHA by Multi-Scale Corner Structure Model with Fast Pattern Matching
Recognizing objects in adversarial clutter: breaking a visual CAPTCHA
Gestalt geometric CAPTCHA
reCAPTCHA: Human-Based Character Recognition via Web Security Measures
An efficient segmentation algorithm for CAPTCHAs with line cluttering and character warping
Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context
Recognition based segmentation of connected characters in text based CAPTCHAs
The robustness of hollow CAPTCHAs
I Am 'Totally' Human: Bypassing the reCaptcha
Image Recognition CAPTCHAs
Mitigating denial of service attack using CAPTCHA mechanism
A three-way investigation of a game-CAPTCHA: automated attacks, relay attacks and usability
Distortion estimation techniques in solving visual CAPTCHAs
Neural network CAPTCHA crackers
Asirra: a CAPTCHA that exploits interest-aligned manual image categorization
CAPTCHAs: An Artificial Intelligence Application to Web Security
CAPTCHA Breaking with Deep Learning
Breaking CAPTCHAs with Convolutional Neural Networks
On-Line and Off-Line Handwriting Recognition : A Comprehensive Survey
Tessier no. 4 facial cleft: evolution of surgical treatment in a large series of patients.
genetic diversity and evolution of hepatitis c virus - - 15 years on .
Honey for Nutrition and Health: A Review
Reassessing Escherichia coli as a cell factory for biofuel production