1. Fairclough, S. & Maternaghan, M. in Visual Search 2 (eds Brogan, D., Gale, A. & Carr, K.) 419–431 (Taylor & Francis, London, (1993)).
2. Helsen, W. & Pauwels, J. M. in Visual Search 2 (eds Brogan, D., Gale, A. & Carr, K.) 379–388 (Taylor & Francis, London, (1993)).
3. Gale, A. G. & Walker, G. E. in Visual Search 2 (eds Brogan, D., Gale, A. & Carr, K.) 231–238 (Taylor & Francis, London, (1993)).
4. Wolfe, J. M. What can 1 million trials tell us about visual search? Psychol. Sci. 9, 33–39 (1998).
5. Treisman, A. & Gelade, G. Afeature–integration theory of attention. Cogn. Psychol. 12, 97–136 (1980).