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http://www.inf.fu-berlin.de/lehre/SS10/SP-Par/download/lp.pdf
http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&ved=0CFEQFjAH&url=http%3A%2F%2Fetna.mcs.kent.edu%2Fvol.28.2007-2008%2Fpp174-189.dir%2Fpp174-189.pdf&ei=Y3ORUIK5CKftygH8w4DQDw&usg=AFQjCNHO8JqPNO6nt_bXNmMZ53wBtfNuAQ
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6062991&abstractAccess=no&userType=inst
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6009074&abstractAccess=no&userType=inst
http://dpcs.uoc.edu/joomla/images/stories/workshop2012/presentations/t2/alvaro_garcia.pdf