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[Gallian]
Joseph A. Gallian
A Dynamic Survey of Graph Labeling
The Electronic Journal of Combinatorics, 2014

[SmithPuget]
B.M. Smith and Jean-Francois Puget
Constraint models for Graceful Graphs
Constraints, 64-92, 2010

[PetrieSmith]
Karen E. J. Petrie and Barbara M. Smith
Symmetry Breaking in Graceful Graphs
Proc. CP 2003, 2003