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2. Uniqueness of orthogonal connect-the-dots;O'Rourke,1988
3. Connected rectilinear graphs on point sets;Löffler,2008
4. D. Rappaport, On the complexity of computing orthogonal polygons from a set of points, Tech. Rep. SOCS-86.9, McGill U., Montréal, Canada, 1986.
5. Reconstructing polygons from scanner data;Biedl,2009