Attila J. Bergou, Leif Ristroph, John Guckenheimer, Itai Cohen, and Z. Jane WangApr, 2010PHYS. REV. LETT. 104, 148101 (Apr 2010) Journal Link: http://dx.doi.org/10.1103/PhysRevLett.104.148101Publication File: AttilaPRL2010.pdf