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Supported in part by NSF grants DMS-8908717, DMS-9207019.
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Breen, M. A Krasnosel'skii theorem for staircase paths in orthogonal polygons. J Geom 51, 22–30 (1994). https://doi.org/10.1007/BF01226853
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DOI: https://doi.org/10.1007/BF01226853