A. Pavlogiannis, J. Tkadlec, K. Chatterjee, and M. Nowak , “Strong amplifiers of natural selection.” Institute of Science and Technology Austria, 2017.
LibreCat: https://research-explorer.ista.ac.at/record/5559
DOI: 10.15479/AT:ISTA:51

N. H. Barton, “Differentiation,” in Encyclopedia of Biodiversity, 2nd ed., Elsevier, 2013, pp. 508–515.
LibreCat: https://research-explorer.ista.ac.at/record/10899
DOI: 10.1016/b978-0-12-384719-5.00031-9