# An Attack on Hollow CAPTCHA Using Accurate Filling and Nonredundant Merging

> Research article (IETE Technical Review, 2018) · cited 13× · AI/ML

**Wikidata**: [openalex:W2892096034](https://www.wikidata.org/wiki/openalex:W2892096034)  
**Source**: https://4ort.xyz/entity/an-attack-on-hollow-captcha-using-accurate-filling-and-nonredundant-merging