D. McCollin, R. C. Preece, and T. H. Sparks, “Pushing back the baseline: A novel approach to detect long-term changes in terrestrial faunal abundance using historical qualitative descriptions”, EuroJEcol, vol. 1, no. 1, pp. 32–42, Jun. 2015, doi: 10.1515/eje-2015-0005.