Edelsbrunner, Herbert, and Emo Welzl. “On the Maximal Number of Edges of Many Faces in an Arrangement.”https://doi.org/10.1016/0097-3165(86)90078-6__Journal of Combinatorial Theory Series A. Elsevier, 1986.https://doi.org/10.1016/0097-3165(86)90078-6 .

Edelsbrunner, Herbert, and Gerd Stöckl. “The Number of Extreme Pairs of Finite Point-Sets in Euclidean Spaces.”https://doi.org/10.1016/0097-3165(86)90075-0__Journal of Combinatorial Theory Series A. Elsevier, 1986.https://doi.org/10.1016/0097-3165(86)90075-0 .

Edelsbrunner, Herbert, and Emo Welzl. “On the Number of Line Separations of a Finite Set in the Plane.”https://doi.org/10.1016/0097-3165(85)90017-2__Journal of Combinatorial Theory Series A. Elsevier, 1985.https://doi.org/10.1016/0097-3165(85)90017-2 .