Edelsbrunner, H., &; Maurer, H. (1981). On the intersection of Orthogonal objects. Information Processing Letters. Elsevier.https://doi.org/10.1016/0020-0190(81)90053-3 
LibreCat: https://research-explorer.ista.ac.at/record/4132
DOI: 10.1016/0020-0190(81)90053-3