Griffiths, I. W., Chung, D. H., Parry, M. L., Legg, P., & Chen, M. (2011). Hierarchical event selection for video storyboards with a case study on snooker video visualization. IEEE Transactions on Visualization and Computer Graphics, 17(12), 1747-1756. https://doi.org/10.1109/TVCG.2011.208