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http://delivery.acm.org/10.1145/320000/312649/p50-hofmann.pdf?ip=203.205.141.125&id=312649&acc=ACTIVE%20SERVICE&key=39FCDE838982416F%2E39FCDE838982416F%2E4D4702B0C3E38B35%2E4D4702B0C3E38B35&CFID=872095450&CFTOKEN=65106311&__acm__=1480910021_53e33eec9549c24ea3813a731dd263c7