- CSB - MetaPress - Google - Bing - Yahoo
 | 2008 | |
|---|---|---|
| 1 |      | Richard Chow, Philippe Golle, Markus Jakobsson, Lusha Wang, XiaoFeng Wang: Making CAPTCHAs clickable. HotMobile 2008: 91-94 |
| 1 | Richard Chow | [1] |
| 2 | Philippe Golle | [1] |
| 3 | Markus Jakobsson | [1] |
| 4 | XiaoFeng Wang | [1] |