Rodrigo Alves Costa, Ruy J. G. B. de Queiroz, Elmano Ramalho Cavalcanti. A Proposal to Prevent Click-Fraud Using Clickable CAPTCHAs. In Sixth International Conference on Software Security and Reliability, SERE 2012, Gaithersburg, Maryland, USA, 20-22 June 2012 - Companion Volume. pages 62-67, IEEE, 2012. [doi]
Abstract is missing.