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LibreCat: https://research-explorer.ista.ac.at/record/4065
DOI: 10.1016/0012-365X(90)90147-A

Edelsbrunner, H., &; Haussler, D. (1986). The complexity of cells in 3-dimensional arrangements. Discrete Mathematics. Elsevier.https://doi.org/10.1016/0012-365X(86)90008-7 
LibreCat: https://research-explorer.ista.ac.at/record/4107
DOI: 10.1016/0012-365X(86)90008-7