• Adrain, J. M., and Westrop, S. R. 2005. Evenness and diversity of Lower Palaeozoic trilobite faunas of Laurentia. Palaeontological Association Annual Conference, Oxford, England.

• Hegna, T., and Adrain, J. M. 2004. Reduced biofacies differentiation in Silurian trilobite faunas of Laurentia. Geological Society of America Abstracts with Programs, 36(5):177.

• Westrop, S. R., and Adrain, J. M. 2001. Sampling at the species level: impact of spatial biases on diversity gradients. Geology, 29:903–906.

• Adrain, J. M., Westrop, S. R., Chatterton, B. D. E., and Ramsköld, L. 2000. Silurian trilobite alpha diversity and the end–Ordovician mass extinction. Paleobiology, 26: 625–646.

• Westrop, S. R., and Adrain, J. M. 1998. Trilobite diversity and the Ordovician Radiation: a reply. Paleobiology, 24:529–533.

• Westrop, S. R., and Adrain, J. M. 1998. Trilobite alpha diversity and the reorganization of Ordovician benthic marine communities. Paleobiology, 24:1–16.