Jun Ma Ai-Hua Zhang Ya-Feng Xia Li-Ping Zhang Optimize design of adaptive synchronization controllers and parameter observers in different hyperchaotic systems. 3318-3326 2010 215 Applied Mathematics and Computation 9 http://dx.doi.org/10.1016/j.amc.2009.10.020 db/journals/amc/amc215.html#MaZXZ10