[hoanvu1990]

http://ieeexplore.ieee.org/xpl/artic...rnumber=962755
http://ieeexplore.ieee.org/xpl/artic...rnumber=844193
http://ieeexplore.ieee.org/xpl/artic...number=5054573
http://ieeexplore.ieee.org/xpl/artic...number=5364628
http://www.springerlink.com/content/rv68830226227896/
http://dl.acm.org/citation.cfm?id=1283264
http://www.sciencedirect.com/science...65168403002184

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