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My Erdös number is 2!

One possible path:

(1) Paul Erdös, János Pach, Richard Pollack, and Zsolt Tuza. "Radius, diameter, and minimum degree", J. Combin. Theory Ser. B 47 (1989), no. 1, 73--79.

(2) Betsy Crull, Tammy Cundiff, Paul Feltman, Glenn Hurlbert, Lara Pudwell, Zsuzsanna Szaniszlo, Zsolt Tuza, "The Cover Pebbling Number of Graphs", Discrete Mathematics 296 (2005), 15--23

What is an Erdös number? Find out here: http://www.oakland.edu/enp/.