Sims, D. W., Reynolds, A. M., Humphries, N. E., Southall, E. J., Wearmouth, V. J., Metcalfe, B., & Twitchett, R. J. (2014). Hierarchical random walks in trace fossils and the origin of optimal search behavior. National Academy of Sciences.

Sims, David W., Andrew M. Reynolds, Nicolas E. Humphries, Emily J. Southall, Victoria J. Wearmouth, Brett Metcalfe, und Richard J. Twitchett. Hierarchical Random Walks in Trace Fossils and the Origin of Optimal Search Behavior. National Academy of Sciences, 2014.

Sims, David W., et al. Hierarchical Random Walks in Trace Fossils and the Origin of Optimal Search Behavior. National Academy of Sciences, 2014.