Discussiones Mathematicae Graph Theory 33(2) (2013)
411-428

doi: 10.7151/dmgt.1678

Bryan Phinezy and Ping Zhang
Department of Mathematics |

**Keywords:** trees, closed modular *k*-coloring, closed modular chromatic number

**2010 Mathematics Subject Classification:** 05C05, 05C15.

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Received 11 January 2012

Accepted 11 June 2012