conf/sigmod/91 Guy M. Lohman George Lapis Tobin J. Lehman Rakesh Agrawal Roberta Cochrane John McPherson C. Mohan Hamid Pirahesh Jennifer Widom Starburst II: The Extender Strikes Back! 447 SIGMOD91/P447.PDF 1991 SIGMOD Conference db/conf/sigmod/sigmod91.html#LohmanLLACMMPW91 http://doi.acm.org/10.1145/115790.115864 db/conf/sigmod/LohmanLLACMMPW91.html