Griffith, Shane, and Alexander Stoytchev. “Interactive Categorization of Containers and Non-Containers by Unifying Categorizations Derived from Multiple Exploratory Behaviors”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 24, no. 1, July 2010, pp. 1931-2, doi:10.1609/aaai.v24i1.7771.