C. Neely, and P. Weller. Working paper, 1999-016B. Federal Reserve Bank of St. Louis, Research Division, 411 Locust Street, St. Louis, MO 63102, USA, (10 January 2001)
P. Rosin, and H. Nyongesa. Real-World Applications of Evolutionary Computing, volume 1803 of LNCS, page 87--96. Edinburgh, Springer-Verlag, (17 April 2000)