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Edelsbrunner, H. (1983). A new approach to rectangle intersections part 1. International Journal of Computer Mathematics. Taylor &; Francis.https://doi.org/10.1080/00207168308803364 

Barton, N. H., &; Hewitt, G. (1983). Hybrid zones as barriers to gene flow. In G. Oxford &; D. Rollinson (Eds.), Protein polymorphism: Adaptive and taxonomic significance (Vol. 24, pp. 341–359). University of York, United Kingdom: Academic Press.

Barton, N. H., &; Hewitt, G. (1982). A measurement of dispersal in the grasshopper Podisma pedestris (Orthoptera: Acrididae). Heredity. Springer Nature.https://doi.org/10.1038/hdy.1982.29 

Edelsbrunner, H., &; Maurer, H. (1981). A space-optimal solution of general region location. Theoretical Computer Science. Elsevier.https://doi.org/10.1016/0304-3975(81)90103-1 

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Hewitt, G., &; Barton, N. H. (1980). The structure and maintenance of hybrid zones as exemplified by Podisma pedestris. In R. Blackman &; M. Ashburner (Eds.), Insect Cytogenetics (Vol. 10, pp. 149–170). Wiley-Blackwell.