Optimal pebbling in products of graphs. - David S. Herscovici; Benjamin D. Hester; Glenn H. Hurlbert (Australas. J Comb., 2011)

Generalizations of Graham's pebbling conjecture. - David S. Herscovici; Benjamin D. Hester; Glenn H. Hurlbert (Discret. Math., 2012)

t-Pebbling and Extensions. - David S. Herscovici; Benjamin D. Hester; Glenn H. Hurlbert (Graphs Comb., 2013)