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"Every four-colorable graph is isomorphic to a subgraph of the Visibility ..."
David Flores-Peñaloza, Francisco Javier Zaragoza Martínez (2009)
- David Flores-Peñaloza, Francisco Javier Zaragoza Martínez:
Every four-colorable graph is isomorphic to a subgraph of the Visibility Graph of the Integer Lattice. CCCG 2009: 91-94
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