K. Clarkson, H. Edelsbrunner, L. Guibas, M. Sharir, and E. Welzl, “Combinatorial complexity bounds for arrangements of curves and spheres,” Discrete &; Computational Geometry, vol. 5, no. 1. Springer, pp. 99–160, 1990.

N. Mizuno, T. Ueyama, K. Itoh, T. Satoda, T. Tashiro, and R. Shigemoto, “Direct projections from the subthalamic nucleus of Luys to the spinal cord in the Japanese monkey,” Neuroscience Letters, vol. 89, no. 1. Elsevier, pp. 13–18, 1988.

H. Edelsbrunner, Algorithms in Combinatorial Geometry, vol. 10. Berlinf; Heidelberg: Springer, 1987.

N. H. Barton and R. J. Post, “Sibling competition and the advantage of mixed families,” Journal of Theoretical Biology, vol. 120, no. 4. Elsevier, pp. 381–387, 1986.

H. Edelsbrunner, J. O’Rourke, and E. Welzl, “Stationing guards in rectilinear art galleries,” Computer Vision, Graphics, and Image Processing, vol. 27, no. 2. Elsevier, pp. 167–176, 1984.

N. H. Barton and G. Hewitt, “Hybrid zones and speciation,” in Evolution and Speciation, W. Atchley and D. Woodruff, Eds. Cambridge University Press, 1981, pp. 109–145.

G. Hewitt and N. H. Barton, “The structure and maintenance of hybrid zones as exemplified by Podisma pedestris,” in Insect Cytogenetics, vol. 10, R. Blackman and M. Ashburner, Eds. Wiley-Blackwell, 1980, pp. 149–170.