While, A. M., A. Baker, M. Bloss, P. E. Burrows, E. N. Efthimiadis, M. Brooks, D. MacCarn, T. Shepard, and C. Twohill. “PB Core--the Public Broadcasting Metadata Initiative: Progress Report”. International Conference on Dublin Core and Metadata Applications, Sept. 2003, pp. pp. 213-222, https://dcpapers-past.dublincore.org/pubs/article/view/749.