1. M. Benantar, U. Dogrusöz, J.E. Flaherty, M.S. Krishnamoorthy, Coloring quadtrees, Manuscript, 1996.
2. M. Benantar, J.E. Flaherty, M.S. Krishnamoorthy, Coloring procedures for finite element computation on shared-memory parallel computers, in: Adaptive, Multilevel, and Hierarchical Computation Strategies, AMD, Vol. 157, New York, 1992, pp. 435–449.
3. Algorithms for coloring quadtrees;Eppstein;Algorithmica,2002
4. The four-colour theorem;Robertson;J. Combin. Theory Ser. B,1997
5. The quadtree and related hierarchical data structures;Samet;ACM Comput. Surveys (CSUR),1984