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

Barton NH. The width of the hybrid zone in Caledia captiva. Heredity. 1981;47:279-282. doi:10.1038/hdy.1981.86
LibreCat: https://research-explorer.ista.ac.at/record/3671
DOI: 10.1038/hdy.1981.86

Edelsbrunner H, Maurer H. A space-optimal solution of general region location. Theoretical Computer Science. 1981;16(3):329-336. doi:10.1016/0304-3975(81)90103-1
LibreCat: https://research-explorer.ista.ac.at/record/4133
DOI: 10.1016/0304-3975(81)90103-1

Edelsbrunner H, Maurer H. On the intersection of Orthogonal objects. Information Processing Letters. 1981;13(4-5):177-181. doi:10.1016/0020-0190(81)90053-3
LibreCat: https://research-explorer.ista.ac.at/record/4132
DOI: 10.1016/0020-0190(81)90053-3

Barton NH, Hewitt G. Hybrid zones and speciation. In: Atchley W, Woodruff D, eds. Evolution and Speciation. Cambridge University Press; 1981:109-145.
LibreCat: https://research-explorer.ista.ac.at/record/4332

Barton NH, Hewitt G. The genetic basis of hybrid inviability between two chromosomal races of the grasshopper Podisma pedestris. Heredity. 1981;47(3):367-383. doi:10.1038/hdy.1981.98
LibreCat: https://research-explorer.ista.ac.at/record/4333
DOI: 10.1038/hdy.1981.98