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- John W. Hagood, Brian S. Thomson
- The American Mathematical Monthly
- 2006

- Michel Bataille, John W. Hagood
- The American Mathematical Monthly
- 2008

- Christopher Andrew Belford, John Hagood, Janet McShane
- 2012

Place a whole number of pebbles on the vertices of a simple, connected graph G; this is called a pebble distribution. A rubbling move consists of removing a total of two pebbles from some neighbor(s) of a vertex v of G and placing a single pebble on v. A vertex v of G is called reachable from an initial pebble distribution p if there is a sequence of… (More)

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