Nodal Dynamics, Not Degree Distributions, Determine the Structural Controllability of Complex Networks, Bergstrom Carl T, Cowan Noah J., Chastain Erick J., Vilhena Daril A., Freudenberg James S., and Emmert-Streib Frank, PLoS ONE, 10/2013, Volume 7, Issue 6, p.e38398 (2012)