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LibreCat: https://research-explorer.ista.ac.at/record/4095
DOI: 10.1109/TC.1987.5009474

Edelsbrunner, Herbert, and Xiaojun Shen. “A Tight Lower Bound on the Size of Visibility Graphs.”https://doi.org/10.1016/0020-0190(87)90038-X__Information Processing Letters. Elsevier, 1987.https://doi.org/10.1016/0020-0190(87)90038-X .
LibreCat: https://research-explorer.ista.ac.at/record/4094
DOI: 10.1016/0020-0190(87)90038-X