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Kokichi Sugihara Masao Iri Hiroshi Inagaki T. Imai Topology-Oriented Implementation - An Approach to Robust Geometric Algorithms. 5-20 2000 27 Algorithmica 1 http://link.springer.de/link/service/journals/00453/bibs/0027001/00270005.html db/journals/algorithmica/algorithmica27.html#SugiharaIII00