Close, J. and Hahn, Ulrike and Hodgetts, C. and Pothos, E.M. (2010) Rules versus similarity in concept learning. In: Mareschal, Denis and Quinn, P.C. and Lea, S. (eds.) The making of human concepts. Developmental Cognitive Neuroscience. Oxford, UK: Oxford University Press, pp. 29-52. ISBN 9780199549221.

Hodgetts, C. and Hahn, Ulrike and Chater, N. (2009) Transformations and asymmetry. In: Taatgen, N. and van Rijn, H. (eds.) Proceedings of the 31st Annual Meeting of the Cognitive Science Society. Austin, Texas, USA: Cognitive Science Society, pp. 2968-2973. ISBN 9780976831853.

Hodgetts, C. and Hahn, Ulrike and Chater, N. (2009) The role of transformations and structure in the same-different paradigm. In: Taatgen, N. and van Rijn, H. (eds.) Proceedings of the 31st Annual Meeting of the Cognitive Science Society. Austin, Texas, USA: Cognitive Science Society, pp. 1400-1405. ISBN 9780976831853.