Woodworth, B. L., Atkinson, C. T., LaPointe, D. A., Hart, P. J., Spiegel, C. S., Tweed, E. J., et al. (2005). . Proceedings Of The National Academy Of Sciences, 102, 1531-1536. http://doi.org/10.1073/pnas.0409454102 (Original work published 02/2005AD)