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Pankaj K. Agarwal Eran Nevo János Pach Rom Pinchasi Micha Sharir Shakhar Smorodinsky Lenses in arrangements of pseudo-circles and their applications. 139-186 2004 51 J. ACM 2 http://doi.acm.org/10.1145/972639.972641 db/journals/jacm/jacm51.html#AgarwalNPPSS04