Barton NH. 1983. Multilocus clines. Evolution; International Journal of Organic Evolution. 37(3), 454–471.
LibreCat: https://research-explorer.ista.ac.at/record/3668
DOI: 10.2307/2408260
PMID: 28563316 

Barton NH. 1982. The structure of the hybrid zone in Uroderma bilobatum (Chiroptera: Phyllostomatidae). Evolution. 36(4), 863–866.
LibreCat: https://research-explorer.ista.ac.at/record/4331
DOI: 10.1111/j.1558-5646.1982.tb05452.x
PMID: 28568238

Barton NH, Hewitt G. 1981. A chromosomal cline in the grasshopper Podisma pedestris. Evolution; International Journal of Organic Evolution. 35(5), 1008–1018.
LibreCat: https://research-explorer.ista.ac.at/record/3670
DOI:  10.1111/j.1558-5646.1981.tb04966.x
PMID: 28581059