Lin, X., M. Khoo, J.- wook Ahn, C. Binding, D. Tudhope, H. Jones, and D. Massam. “A DDC Visual Interface for Metadata Exploration”. International Conference on Dublin Core and Metadata Applications, Sept. 2015, pp. 158-69, https://dcpapers-past.dublincore.org/pubs/article/view/3771.