B. Bairagi, B. Dey, B. Sarkar, and S. Sanyal. International Journal on Soft Computing, Artificial Intelligence and Applications (IJSCAI),, 1 (3):
9(December 2012)
A. Camargo, J. Stern, and M. Lauretto. AIP Conference Proceedings, 1443, page 206--213. Waterloo, Ontario, Canada, American Institute of Physics, (May 2012)