Discussiones Mathematicae Graph Theory 28(3) (2008)
501-510
doi: 10.7151/dmgt.1423
Ana Paulina Figueroa
Instituto de Matemáticas | Eduardo Rivera-Campo
Departmento de Matemáticas |
Keywords: tree graph, property Δ^{*}, property Δ^{+}.
2000 Mathematics Subject Classification: 05C05.
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Received 12 February 2008
Revised 18 June 2008
Accepted 18 June 2008