1. Brodić D, Amelio A, Ahmad N, Shahzad SK (2017) Usability analysis of the image and interactive CAPTCHA via prediction of the response time. In: Proceedings of 11th multi-disciplinary international workshop on artificial intelligence (MIWAI), Brunei, 20–22 Nov 2017. LNCS, vol 10607. Springer, pp 252–265
2. Brodić D, Amelio A (2016) Analysis of the human-computer interaction on the example of image-based CAPTCHA by association rule mining. In: Proceedings of 5th international workshop on symbiotic interaction (symbiotic), Padua, Italy, 29–30 Sept 2016. LNCS. Springer, pp 38–51
3. Agrawal R, Srikant R (1994) Fast algorithms for mining association rules. In: Proceedings of the 20th international conference on very large data bases. VLDB, Santiago, Chile, pp 487–499