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https://link.springer.com/content/pdf/10.1007%2F978-3-642-03129-8_6.pdf (Verlagsversion)
Graf, M. (2010). Categorization and Object Shape. In M. Glatzeder, V. Goel, & A. Müller (Eds.), Towards a theory of thinking: building blocks for a conceptual framework (pp. 73-101). Berlin, Germany: Springer. doi:10.1007/978-3-642-03129-8_6.