Four multiconnected-polygon partition problems are shown to be NP-hard.
CITATION STYLE
Lingas, A. (1982). The power of non-rectilinear holes. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 140 LNCS, pp. 369–383). Springer Verlag. https://doi.org/10.1007/BFb0012784
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